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

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package web
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import (
"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 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 {
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
}
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"))
}
}