owl-blogs/cmd/owl/web/handler.go

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package web
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import (
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"encoding/json"
"fmt"
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"h4kor/owl-blogs"
"net/http"
"net/url"
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"os"
"path"
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"strings"
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"github.com/julienschmidt/httprouter"
)
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func getUserFromRepo(repo *owl.Repository, ps httprouter.Params) (owl.User, error) {
if config, _ := repo.Config(); config.SingleUser != "" {
return repo.GetUser(config.SingleUser)
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}
userName := ps.ByName("user")
user, err := repo.GetUser(userName)
if err != nil {
return owl.User{}, err
}
return user, nil
}
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func repoIndexHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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html, err := owl.RenderUserList(*repo)
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if err != nil {
println("Error rendering index: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
println("Rendering index")
w.Write([]byte(html))
}
}
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func userIndexHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
html, err := owl.RenderIndexPage(user)
if err != nil {
println("Error rendering index page: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
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println("Rendering index page for user", user.Name())
w.Write([]byte(html))
}
}
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func userAuthHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user, err := getUserFromRepo(repo, ps)
if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
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// get me, cleint_id, redirect_uri, state and response_type from query
me := r.URL.Query().Get("me")
clientId := r.URL.Query().Get("client_id")
redirectUri := r.URL.Query().Get("redirect_uri")
state := r.URL.Query().Get("state")
responseType := r.URL.Query().Get("response_type")
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codeChallenge := r.URL.Query().Get("code_challenge")
codeChallengeMethod := r.URL.Query().Get("code_challenge_method")
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// check if request is valid
missing_params := []string{}
if clientId == "" {
missing_params = append(missing_params, "client_id")
}
if redirectUri == "" {
missing_params = append(missing_params, "redirect_uri")
}
if responseType == "" {
missing_params = append(missing_params, "response_type")
}
if len(missing_params) > 0 {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(fmt.Sprintf("Missing parameters: %s", strings.Join(missing_params, ", "))))
return
}
if responseType != "id" {
responseType = "code"
}
if responseType != "code" {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Invalid response_type. Must be 'code' ('id' converted to 'code' for legacy support)."))
return
}
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if codeChallengeMethod != "" && (codeChallengeMethod != "S256" && codeChallengeMethod != "plain") {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Invalid code_challenge_method. Must be 'S256' or 'plain'."))
return
}
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// check if redirect_uri is registered
resp, _ := repo.HttpClient.Get(clientId)
registered_redirects, _ := repo.Parser.GetRedirctUris(resp)
is_registered := false
for _, registered_redirect := range registered_redirects {
if registered_redirect == redirectUri {
// redirect_uri is registered
is_registered = true
break
}
}
if !is_registered {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Invalid redirect_uri. Must be registered with client_id."))
return
}
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// Double Submit Cookie Pattern
// https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#double-submit-cookie
csrfToken := owl.GenerateRandomString(32)
cookie := http.Cookie{
Name: "csrf_token",
Value: csrfToken,
}
http.SetCookie(w, &cookie)
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reqData := owl.AuthRequestData{
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Me: me,
ClientId: clientId,
RedirectUri: redirectUri,
State: state,
ResponseType: responseType,
CodeChallenge: codeChallenge,
CodeChallengeMethod: codeChallengeMethod,
User: user,
CsrfToken: csrfToken,
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}
html, err := owl.RenderUserAuthPage(reqData)
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if err != nil {
println("Error rendering auth page: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
println("Rendering auth page for user", user.Name())
w.Write([]byte(html))
}
}
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func userAuthProfileHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user, err := getUserFromRepo(repo, ps)
if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
// get form data from post request
err = r.ParseForm()
if err != nil {
println("Error parsing form: ", err.Error())
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Error parsing form"))
return
}
code := r.Form.Get("code")
client_id := r.Form.Get("client_id")
redirect_uri := r.Form.Get("redirect_uri")
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code_verifier := r.Form.Get("code_verifier")
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// check if request is valid
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valid := user.VerifyAuthCode(code, client_id, redirect_uri, code_verifier)
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if !valid {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Invalid code"))
return
} else {
w.WriteHeader(http.StatusOK)
type ResponseProfile struct {
Name string `json:"name"`
Url string `json:"url"`
Photo string `json:"photo"`
}
type Response struct {
Me string `json:"me"`
Profile ResponseProfile `json:"profile"`
}
response := Response{
Me: user.FullUrl(),
Profile: ResponseProfile{
Name: user.Name(),
Url: user.FullUrl(),
Photo: user.AvatarUrl(),
},
}
jsonData, err := json.Marshal(response)
if err != nil {
println("Error marshalling json: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
}
w.Write(jsonData)
return
}
}
}
func userAuthVerifyHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user, err := getUserFromRepo(repo, ps)
if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
// get form data from post request
err = r.ParseForm()
if err != nil {
println("Error parsing form: ", err.Error())
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Error parsing form"))
return
}
password := r.FormValue("password")
client_id := r.FormValue("client_id")
redirect_uri := r.FormValue("redirect_uri")
response_type := r.FormValue("response_type")
state := r.FormValue("state")
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code_challenge := r.FormValue("code_challenge")
code_challenge_method := r.FormValue("code_challenge_method")
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// CSRF check
formCsrfToken := r.FormValue("csrf_token")
cookieCsrfToken, err := r.Cookie("csrf_token")
if err != nil {
println("Error getting csrf token from cookie: ", err.Error())
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Error getting csrf token from cookie"))
return
}
if formCsrfToken != cookieCsrfToken.Value {
println("Invalid csrf token")
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Invalid csrf token"))
return
}
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password_valid := user.VerifyPassword(password)
if !password_valid {
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redirect := fmt.Sprintf(
"%s?error=invalid_password&client_id=%s&redirect_uri=%s&response_type=%s&state=%s",
user.AuthUrl(), client_id, redirect_uri, response_type, state,
)
if code_challenge != "" {
redirect += fmt.Sprintf("&code_challenge=%s&code_challenge_method=%s", code_challenge, code_challenge_method)
}
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http.Redirect(w, r,
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redirect,
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http.StatusFound,
)
return
} else {
// password is valid, generate code
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code, err := user.GenerateAuthCode(
client_id, redirect_uri, code_challenge, code_challenge_method)
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if err != nil {
println("Error generating code: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
http.Redirect(w, r,
fmt.Sprintf(
"%s?code=%s&state=%s",
redirect_uri, code, state,
),
http.StatusFound,
)
return
}
}
}
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func userWebmentionHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user, err := getUserFromRepo(repo, ps)
if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("User not found"))
return
}
err = r.ParseForm()
if err != nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Unable to parse form data"))
return
}
params := r.PostForm
target := params["target"]
source := params["source"]
if len(target) == 0 {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("No target provided"))
return
}
if len(source) == 0 {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("No source provided"))
return
}
if len(target[0]) < 7 || (target[0][:7] != "http://" && target[0][:8] != "https://") {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Not a valid target"))
return
}
if len(source[0]) < 7 || (source[0][:7] != "http://" && source[0][:8] != "https://") {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Not a valid source"))
return
}
if source[0] == target[0] {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("target and source are equal"))
return
}
tryAlias := func(target string) *owl.Post {
parsedTarget, _ := url.Parse(target)
aliases, _ := repo.PostAliases()
fmt.Printf("aliases %v", aliases)
fmt.Printf("parsedTarget %v", parsedTarget)
if _, ok := aliases[parsedTarget.Path]; ok {
return aliases[parsedTarget.Path]
}
return nil
}
var aliasPost *owl.Post
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parts := strings.Split(target[0], "/")
if len(parts) < 2 {
aliasPost = tryAlias(target[0])
if aliasPost == nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Not found"))
return
}
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}
postId := parts[len(parts)-2]
foundPost, err := user.GetPost(postId)
if err != nil && aliasPost == nil {
aliasPost = tryAlias(target[0])
if aliasPost == nil {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("Post not found"))
return
}
}
if aliasPost != nil {
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foundPost = aliasPost
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}
err = foundPost.AddIncomingWebmention(source[0])
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if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Unable to process webmention"))
return
}
w.WriteHeader(http.StatusAccepted)
w.Write([]byte(""))
}
}
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func userRSSHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user, err := getUserFromRepo(repo, ps)
if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
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xml, err := owl.RenderRSSFeed(user)
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if err != nil {
println("Error rendering index page: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
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println("Rendering index page for user", user.Name())
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w.Header().Set("Content-Type", "application/rss+xml")
w.Write([]byte(xml))
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}
}
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func postHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
postId := ps.ByName("post")
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
post, err := user.GetPost(postId)
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if err != nil {
println("Error getting post: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
meta := post.Meta()
if meta.Draft {
println("Post is a draft")
notFoundHandler(repo)(w, r)
return
}
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html, err := owl.RenderPost(post)
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if err != nil {
println("Error rendering post: ", err.Error())
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("Internal server error"))
return
}
println("Rendering post", postId)
w.Write([]byte(html))
}
}
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func postMediaHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
postId := ps.ByName("post")
filepath := ps.ByName("filepath")
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user, err := getUserFromRepo(repo, ps)
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if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
post, err := user.GetPost(postId)
if err != nil {
println("Error getting post: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
filepath = path.Join(post.MediaDir(), filepath)
if _, err := os.Stat(filepath); err != nil {
println("Error getting file: ", err.Error())
notFoundHandler(repo)(w, r)
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return
}
http.ServeFile(w, r, filepath)
}
}
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func userMediaHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request, httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
filepath := ps.ByName("filepath")
user, err := getUserFromRepo(repo, ps)
if err != nil {
println("Error getting user: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
filepath = path.Join(user.MediaDir(), filepath)
if _, err := os.Stat(filepath); err != nil {
println("Error getting file: ", err.Error())
notFoundHandler(repo)(w, r)
return
}
http.ServeFile(w, r, filepath)
}
}
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func notFoundHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
path := r.URL.Path
aliases, _ := repo.PostAliases()
if _, ok := aliases[path]; ok {
http.Redirect(w, r, aliases[path].UrlPath(), http.StatusMovedPermanently)
return
}
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("Not found"))
}
}