Fill in remaining missing pieces

- Database schema changes, removing obsolete custom domain-related code
- Missing user structs
- Setup verbiage changes
- Missing routes
- Missing error messages

errors.go

@@ -7,21 +7,35 @@ import (
 
 // Commonly returned HTTP errors
 var (
+	ErrBadFormData    = impart.HTTPError{http.StatusBadRequest, "Expected valid form data."}
+	ErrBadJSON        = impart.HTTPError{http.StatusBadRequest, "Expected valid JSON object."}
+	ErrBadJSONArray   = impart.HTTPError{http.StatusBadRequest, "Expected valid JSON array."}
 	ErrBadAccessToken = impart.HTTPError{http.StatusUnauthorized, "Invalid access token."}
 	ErrNoAccessToken  = impart.HTTPError{http.StatusBadRequest, "Authorization token required."}
+	ErrNotLoggedIn    = impart.HTTPError{http.StatusUnauthorized, "Not logged in."}
 
-	ErrForbiddenCollection  = impart.HTTPError{http.StatusForbidden, "You don't have permission to add to this collection."}
-	ErrUnauthorizedEditPost = impart.HTTPError{http.StatusUnauthorized, "Invalid editing credentials."}
-	ErrUnauthorizedGeneral  = impart.HTTPError{http.StatusUnauthorized, "You don't have permission to do that."}
+	ErrForbiddenCollection        = impart.HTTPError{http.StatusForbidden, "You don't have permission to add to this collection."}
+	ErrForbiddenEditPost          = impart.HTTPError{http.StatusForbidden, "You don't have permission to update this post."}
+	ErrUnauthorizedEditPost       = impart.HTTPError{http.StatusUnauthorized, "Invalid editing credentials."}
+	ErrUnauthorizedGeneral        = impart.HTTPError{http.StatusUnauthorized, "You don't have permission to do that."}
+	ErrBadRequestedType           = impart.HTTPError{http.StatusNotAcceptable, "Bad requested Content-Type."}
+	ErrCollectionUnauthorizedRead = impart.HTTPError{http.StatusUnauthorized, "You don't have permission to access this collection."}
 
-	ErrInternalGeneral = impart.HTTPError{http.StatusInternalServerError, "The humans messed something up. They've been notified."}
+	ErrNoPublishableContent = impart.HTTPError{http.StatusBadRequest, "Supply something to publish."}
 
+	ErrInternalGeneral       = impart.HTTPError{http.StatusInternalServerError, "The humans messed something up. They've been notified."}
+	ErrInternalCookieSession = impart.HTTPError{http.StatusInternalServerError, "Could not get cookie session."}
+
+	ErrCollectionNotFound     = impart.HTTPError{http.StatusNotFound, "Collection doesn't exist."}
+	ErrCollectionGone         = impart.HTTPError{http.StatusGone, "This blog was unpublished."}
 	ErrCollectionPageNotFound = impart.HTTPError{http.StatusNotFound, "Collection page doesn't exist."}
 	ErrPostNotFound           = impart.HTTPError{Status: http.StatusNotFound, Message: "Post not found."}
+	ErrPostBanned             = impart.HTTPError{Status: http.StatusGone, Message: "Post removed."}
 	ErrPostUnpublished        = impart.HTTPError{Status: http.StatusGone, Message: "Post unpublished by author."}
 	ErrPostFetchError         = impart.HTTPError{Status: http.StatusInternalServerError, Message: "We encountered an error getting the post. The humans have been alerted."}
 
-	ErrUserNotFound = impart.HTTPError{http.StatusNotFound, "User doesn't exist."}
+	ErrUserNotFound      = impart.HTTPError{http.StatusNotFound, "User doesn't exist."}
+	ErrUserNotFoundEmail = impart.HTTPError{http.StatusNotFound, "Please enter your username instead of your email address."}
 )
 
 // Post operation errors