func getApiPostAuthorsHandler(w http.ResponseWriter,
r *http.Request,
params map[string]string) {
userName := authentication.GetUserName(r)
if userName != "" {
post_id := params["id"]
postId, err := strconv.ParseInt(post_id, 10, 64)
if err != nil || postId < 1 {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
var authors []structure.User
authors, err = database.RetrieveAuthors(postId)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
json, err := json.Marshal(usersToJson(authors))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(json)
return
} else {
http.Error(w, "Not logged in!", http.StatusInternalServerError)
return
}
}
// API function to add and remove post authors
func putApiPostAuthorsHandler(w http.ResponseWriter,
r *http.Request,
params map[string]string) {
userName := authentication.GetUserName(r)
if userName != "" {
userId, err := getUserId(userName)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
userRole, err := getUserRole(userName)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
post_id := params["id"]
postId, err := strconv.ParseInt(post_id, 10, 64)
if err != nil || postId < 1 {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Check the post for existence (there's no foreign key constraint)
post, err := database.RetrievePostById(postId)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Allow this action only to the main author
if post.Author.Id != userId && userRole != 4 {
http.Error(w, "Not your post", http.StatusInternalServerError)
return
}
decoder := json.NewDecoder(r.Body)
var json JsonChangePostAuthors
err = decoder.Decode(&json)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
delete_author_ids := json.Delete
add_author_ids := json.Add
var existing_authors []structure.User
existing_authors, err = database.RetrieveAuthors(postId)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Delete users
for _, author_id := range delete_author_ids {
err = database.DeletePostAuthor(postId, author_id)
// Don't even check for errors
}
// Filter out ones who is already listed as author
for _, author_id := range add_author_ids {
author_exists := false
for _, author := range existing_authors {
if author.Id == author_id {
author_exists = true
break
}
}
if !author_exists {
_, err = database.RetrieveUser(author_id)
if err == nil { // Verify that this user exists in DB
// and save him
_ = database.InsertPostAuthor(int(postId), author_id)
}
}
}
w.WriteHeader(http.StatusOK)
w.Write([]byte("Authors added!"))
return
} else {
http.Error(w, "Not logged in!", http.StatusInternalServerError)
return
}
}