585 lines
17 KiB
Go
585 lines
17 KiB
Go
package writefreely
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import (
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"fmt"
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"html/template"
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"net/http"
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"net/url"
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"runtime/debug"
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"strconv"
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"strings"
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"time"
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"github.com/gorilla/sessions"
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"github.com/writeas/impart"
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"github.com/writeas/web-core/log"
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"github.com/writeas/writefreely/page"
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)
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type UserLevel int
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const (
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UserLevelNone UserLevel = iota // user or not -- ignored
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UserLevelOptional // user or not -- object fetched if user
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UserLevelNoneRequired // non-user (required)
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UserLevelUser // user (required)
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)
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type (
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handlerFunc func(app *app, w http.ResponseWriter, r *http.Request) error
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userHandlerFunc func(app *app, u *User, w http.ResponseWriter, r *http.Request) error
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dataHandlerFunc func(app *app, w http.ResponseWriter, r *http.Request) ([]byte, string, error)
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authFunc func(app *app, r *http.Request) (*User, error)
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)
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type Handler struct {
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errors *ErrorPages
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sessionStore *sessions.CookieStore
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app *app
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}
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// ErrorPages hold template HTML error pages for displaying errors to the user.
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// In each, there should be a defined template named "base".
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type ErrorPages struct {
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NotFound *template.Template
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Gone *template.Template
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InternalServerError *template.Template
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Blank *template.Template
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}
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// NewHandler returns a new Handler instance, using the given StaticPage data,
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// and saving alias to the application's CookieStore.
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func NewHandler(app *app) *Handler {
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h := &Handler{
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errors: &ErrorPages{
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NotFound: template.Must(template.New("").Parse("{{define \"base\"}}<html><head><title>404</title></head><body><p>Not found.</p></body></html>{{end}}")),
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Gone: template.Must(template.New("").Parse("{{define \"base\"}}<html><head><title>410</title></head><body><p>Gone.</p></body></html>{{end}}")),
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InternalServerError: template.Must(template.New("").Parse("{{define \"base\"}}<html><head><title>500</title></head><body><p>Internal server error.</p></body></html>{{end}}")),
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Blank: template.Must(template.New("").Parse("{{define \"base\"}}<html><head><title>{{.Title}}</title></head><body><p>{{.Content}}</p></body></html>{{end}}")),
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},
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sessionStore: app.sessionStore,
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app: app,
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}
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return h
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}
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// SetErrorPages sets the given set of ErrorPages as templates for any errors
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// that come up.
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func (h *Handler) SetErrorPages(e *ErrorPages) {
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h.errors = e
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}
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// User handles requests made in the web application by the authenticated user.
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// This provides user-friendly HTML pages and actions that work in the browser.
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func (h *Handler) User(f userHandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h.handleHTTPError(w, r, func() error {
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var status int
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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log.Error("%s: %s", e, debug.Stack())
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = http.StatusInternalServerError
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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u := getUserSession(h.app, r)
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if u == nil {
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err := ErrNotLoggedIn
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status = err.Status
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return err
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}
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err := f(h.app, u, w, r)
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if err == nil {
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status = http.StatusOK
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} else if err, ok := err.(impart.HTTPError); ok {
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status = err.Status
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} else {
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status = http.StatusInternalServerError
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}
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return err
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}())
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}
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}
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// UserAPI handles requests made in the API by the authenticated user.
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// This provides user-friendly HTML pages and actions that work in the browser.
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func (h *Handler) UserAPI(f userHandlerFunc) http.HandlerFunc {
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return h.UserAll(false, f, func(app *app, r *http.Request) (*User, error) {
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// Authorize user from Authorization header
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t := r.Header.Get("Authorization")
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if t == "" {
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return nil, ErrNoAccessToken
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}
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u := &User{ID: app.db.GetUserID(t)}
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if u.ID == -1 {
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return nil, ErrBadAccessToken
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}
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return u, nil
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})
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}
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func (h *Handler) UserAll(web bool, f userHandlerFunc, a authFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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handleFunc := func() error {
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var status int
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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log.Error("%s: %s", e, debug.Stack())
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impart.WriteError(w, impart.HTTPError{http.StatusInternalServerError, "Something didn't work quite right."})
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status = 500
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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u, err := a(h.app, r)
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if err != nil {
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if err, ok := err.(impart.HTTPError); ok {
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status = err.Status
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} else {
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status = 500
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}
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return err
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}
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err = f(h.app, u, w, r)
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if err == nil {
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status = 200
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} else if err, ok := err.(impart.HTTPError); ok {
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status = err.Status
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} else {
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status = 500
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}
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return err
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}
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if web {
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h.handleHTTPError(w, r, handleFunc())
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} else {
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h.handleError(w, r, handleFunc())
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}
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}
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}
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func (h *Handler) RedirectOnErr(f handlerFunc, loc string) handlerFunc {
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return func(app *app, w http.ResponseWriter, r *http.Request) error {
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err := f(app, w, r)
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if err != nil {
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if ie, ok := err.(impart.HTTPError); ok {
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// Override default redirect with returned error's, if it's a
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// redirect error.
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if ie.Status == http.StatusFound {
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return ie
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}
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}
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return impart.HTTPError{http.StatusFound, loc}
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}
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return nil
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}
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}
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func (h *Handler) Page(n string) http.HandlerFunc {
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return h.Web(func(app *app, w http.ResponseWriter, r *http.Request) error {
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t, ok := pages[n]
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if !ok {
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return impart.HTTPError{http.StatusNotFound, "Page not found."}
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}
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sp := pageForReq(app, r)
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err := t.ExecuteTemplate(w, "base", sp)
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if err != nil {
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log.Error("Unable to render page: %v", err)
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}
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return err
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}, UserLevelOptional)
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}
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func (h *Handler) WebErrors(f handlerFunc, ul UserLevel) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// TODO: factor out this logic shared with Web()
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h.handleHTTPError(w, r, func() error {
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var status int
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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u := getUserSession(h.app, r)
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username := "None"
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if u != nil {
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username = u.Username
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}
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log.Error("User: %s\n\n%s: %s", username, e, debug.Stack())
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = 500
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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var session *sessions.Session
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var err error
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if ul != UserLevelNone {
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session, err = h.sessionStore.Get(r, cookieName)
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if err != nil && (ul == UserLevelNoneRequired || ul == UserLevelUser) {
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// Cookie is required, but we can ignore this error
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log.Error("Handler: Unable to get session (for user permission %d); ignoring: %v", ul, err)
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}
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_, gotUser := session.Values[cookieUserVal].(*User)
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if ul == UserLevelNoneRequired && gotUser {
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to := correctPageFromLoginAttempt(r)
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log.Info("Handler: Required NO user, but got one. Redirecting to %s", to)
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err := impart.HTTPError{http.StatusFound, to}
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status = err.Status
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return err
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} else if ul == UserLevelUser && !gotUser {
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log.Info("Handler: Required a user, but DIDN'T get one. Sending not logged in.")
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err := ErrNotLoggedIn
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status = err.Status
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return err
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}
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}
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// TODO: pass User object to function
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err = f(h.app, w, r)
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if err == nil {
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status = 200
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} else if httpErr, ok := err.(impart.HTTPError); ok {
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status = httpErr.Status
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if status < 300 || status > 399 {
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addSessionFlash(h.app, w, r, httpErr.Message, session)
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return impart.HTTPError{http.StatusFound, r.Referer()}
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}
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} else {
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e := fmt.Sprintf("[Web handler] 500: %v", err)
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if !strings.HasSuffix(e, "write: broken pipe") {
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log.Error(e)
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} else {
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log.Error(e)
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}
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log.Info("Web handler internal error render")
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = 500
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}
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return err
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}())
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}
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}
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// Web handles requests made in the web application. This provides user-
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// friendly HTML pages and actions that work in the browser.
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func (h *Handler) Web(f handlerFunc, ul UserLevel) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h.handleHTTPError(w, r, func() error {
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var status int
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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u := getUserSession(h.app, r)
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username := "None"
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if u != nil {
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username = u.Username
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}
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log.Error("User: %s\n\n%s: %s", username, e, debug.Stack())
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log.Info("Web deferred internal error render")
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = 500
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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if ul != UserLevelNone {
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session, err := h.sessionStore.Get(r, cookieName)
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if err != nil && (ul == UserLevelNoneRequired || ul == UserLevelUser) {
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// Cookie is required, but we can ignore this error
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log.Error("Handler: Unable to get session (for user permission %d); ignoring: %v", ul, err)
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}
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_, gotUser := session.Values[cookieUserVal].(*User)
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if ul == UserLevelNoneRequired && gotUser {
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to := correctPageFromLoginAttempt(r)
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log.Info("Handler: Required NO user, but got one. Redirecting to %s", to)
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err := impart.HTTPError{http.StatusFound, to}
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status = err.Status
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return err
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} else if ul == UserLevelUser && !gotUser {
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log.Info("Handler: Required a user, but DIDN'T get one. Sending not logged in.")
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err := ErrNotLoggedIn
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status = err.Status
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return err
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}
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}
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// TODO: pass User object to function
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err := f(h.app, w, r)
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if err == nil {
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status = 200
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} else if httpErr, ok := err.(impart.HTTPError); ok {
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status = httpErr.Status
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} else {
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e := fmt.Sprintf("[Web handler] 500: %v", err)
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log.Error(e)
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log.Info("Web internal error render")
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = 500
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}
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return err
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}())
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}
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}
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func (h *Handler) All(f handlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h.handleError(w, r, func() error {
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// TODO: return correct "success" status
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status := 200
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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log.Error("%s:\n%s", e, debug.Stack())
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impart.WriteError(w, impart.HTTPError{http.StatusInternalServerError, "Something didn't work quite right."})
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status = 500
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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// TODO: do any needed authentication
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err := f(h.app, w, r)
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if err != nil {
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if err, ok := err.(impart.HTTPError); ok {
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status = err.Status
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} else {
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status = 500
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}
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}
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return err
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}())
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}
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}
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func (h *Handler) Download(f dataHandlerFunc, ul UserLevel) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h.handleHTTPError(w, r, func() error {
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var status int
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start := time.Now()
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defer func() {
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if e := recover(); e != nil {
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log.Error("%s: %s", e, debug.Stack())
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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status = 500
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}
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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}()
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data, filename, err := f(h.app, w, r)
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if err != nil {
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if err, ok := err.(impart.HTTPError); ok {
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status = err.Status
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} else {
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status = 500
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}
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return err
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}
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ext := ".json"
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ct := "application/json"
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if strings.HasSuffix(r.URL.Path, ".csv") {
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ext = ".csv"
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ct = "text/csv"
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} else if strings.HasSuffix(r.URL.Path, ".zip") {
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ext = ".zip"
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ct = "application/zip"
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}
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w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s%s", filename, ext))
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w.Header().Set("Content-Type", ct)
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w.Header().Set("Content-Length", strconv.Itoa(len(data)))
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fmt.Fprint(w, string(data))
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status = 200
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return nil
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}())
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}
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}
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func (h *Handler) Redirect(url string, ul UserLevel) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h.handleHTTPError(w, r, func() error {
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start := time.Now()
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var status int
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if ul != UserLevelNone {
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session, err := h.sessionStore.Get(r, cookieName)
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if err != nil && (ul == UserLevelNoneRequired || ul == UserLevelUser) {
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// Cookie is required, but we can ignore this error
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log.Error("Handler: Unable to get session (for user permission %d); ignoring: %v", ul, err)
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}
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_, gotUser := session.Values[cookieUserVal].(*User)
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if ul == UserLevelNoneRequired && gotUser {
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to := correctPageFromLoginAttempt(r)
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log.Info("Handler: Required NO user, but got one. Redirecting to %s", to)
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err := impart.HTTPError{http.StatusFound, to}
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status = err.Status
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return err
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} else if ul == UserLevelUser && !gotUser {
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log.Info("Handler: Required a user, but DIDN'T get one. Sending not logged in.")
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err := ErrNotLoggedIn
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status = err.Status
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return err
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}
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}
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status = sendRedirect(w, http.StatusFound, url)
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log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
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return nil
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}())
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}
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}
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func (h *Handler) handleHTTPError(w http.ResponseWriter, r *http.Request, err error) {
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if err == nil {
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return
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}
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if err, ok := err.(impart.HTTPError); ok {
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if err.Status >= 300 && err.Status < 400 {
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sendRedirect(w, err.Status, err.Message)
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return
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} else if err.Status == http.StatusUnauthorized {
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q := ""
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if r.URL.RawQuery != "" {
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q = url.QueryEscape("?" + r.URL.RawQuery)
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}
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sendRedirect(w, http.StatusFound, "/login?to="+r.URL.Path+q)
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return
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} else if err.Status == http.StatusGone {
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p := &struct {
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page.StaticPage
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Content *template.HTML
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}{
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StaticPage: pageForReq(h.app, r),
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}
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if err.Message != "" {
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co := template.HTML(err.Message)
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p.Content = &co
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}
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h.errors.Gone.ExecuteTemplate(w, "base", p)
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return
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} else if err.Status == http.StatusNotFound {
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h.errors.NotFound.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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return
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} else if err.Status == http.StatusInternalServerError {
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log.Info("handleHTTPErorr internal error render")
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h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
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return
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} else if err.Status == http.StatusAccepted {
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impart.WriteSuccess(w, "", err.Status)
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return
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} else {
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p := &struct {
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page.StaticPage
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Title string
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Content template.HTML
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}{
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pageForReq(h.app, r),
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fmt.Sprintf("Uh oh (%d)", err.Status),
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|
template.HTML(fmt.Sprintf("<p style=\"text-align: center\" class=\"introduction\">%s</p>", err.Message)),
|
|
}
|
|
h.errors.Blank.ExecuteTemplate(w, "base", p)
|
|
return
|
|
}
|
|
impart.WriteError(w, err)
|
|
return
|
|
}
|
|
|
|
impart.WriteError(w, impart.HTTPError{http.StatusInternalServerError, "This is an unhelpful error message for a miscellaneous internal error."})
|
|
}
|
|
|
|
func (h *Handler) handleError(w http.ResponseWriter, r *http.Request, err error) {
|
|
if err == nil {
|
|
return
|
|
}
|
|
|
|
if err, ok := err.(impart.HTTPError); ok {
|
|
if err.Status >= 300 && err.Status < 400 {
|
|
sendRedirect(w, err.Status, err.Message)
|
|
return
|
|
}
|
|
|
|
// if strings.Contains(r.Header.Get("Accept"), "text/html") {
|
|
impart.WriteError(w, err)
|
|
// }
|
|
return
|
|
}
|
|
|
|
if IsJSON(r.Header.Get("Content-Type")) {
|
|
impart.WriteError(w, impart.HTTPError{http.StatusInternalServerError, "This is an unhelpful error message for a miscellaneous internal error."})
|
|
return
|
|
}
|
|
h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
|
|
}
|
|
|
|
func correctPageFromLoginAttempt(r *http.Request) string {
|
|
to := r.FormValue("to")
|
|
if to == "" {
|
|
to = "/"
|
|
} else if !strings.HasPrefix(to, "/") {
|
|
to = "/" + to
|
|
}
|
|
return to
|
|
}
|
|
|
|
func (h *Handler) LogHandlerFunc(f http.HandlerFunc) http.HandlerFunc {
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
h.handleHTTPError(w, r, func() error {
|
|
status := 200
|
|
start := time.Now()
|
|
|
|
defer func() {
|
|
if e := recover(); e != nil {
|
|
log.Error("Handler.LogHandlerFunc\n\n%s: %s", e, debug.Stack())
|
|
h.errors.InternalServerError.ExecuteTemplate(w, "base", pageForReq(h.app, r))
|
|
status = 500
|
|
}
|
|
|
|
// TODO: log actual status code returned
|
|
log.Info("\"%s %s\" %d %s \"%s\"", r.Method, r.RequestURI, status, time.Since(start), r.UserAgent())
|
|
}()
|
|
|
|
f(w, r)
|
|
|
|
return nil
|
|
}())
|
|
}
|
|
}
|
|
|
|
func sendRedirect(w http.ResponseWriter, code int, location string) int {
|
|
w.Header().Set("Location", location)
|
|
w.WriteHeader(code)
|
|
return code
|
|
}
|