mirror of
https://github.com/vbatts/imgsrv.git
synced 2024-12-25 23:36:30 +00:00
413 lines
9.6 KiB
Go
413 lines
9.6 KiB
Go
package main
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import (
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"fmt"
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"io"
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"labix.org/v2/mgo"
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"labix.org/v2/mgo/bson"
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"log"
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"math/rand"
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"mime"
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"net/http"
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"path/filepath"
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"strings"
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"time"
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)
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func serverErr(w http.ResponseWriter, r *http.Request, e error) {
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log.Printf("Error: %s", e)
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LogRequest(r,503)
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fmt.Fprintf(w,"Error: %s", e)
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http.Error(w, "Service Unavailable", 503)
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return
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}
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/* return a <a href/> for a given filename
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and root is the relavtive base of the explicit link.
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*/
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func linkToFile(root string, filename string) (html string) {
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return fmt.Sprintf("<a href='%s/f/%s'>%s</a>",
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root,
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filename,
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filename)
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}
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/* return the sections of the URI Path.
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This will disregard the leading '/'
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*/
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func chunkURI(uri string) (chunks []string) {
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var str string
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if (uri[0] == '/') {
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str = uri[1:]
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} else {
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str = uri
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}
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return strings.Split(str, "/")
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}
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/* given an url.URL.RawQuery, get a dictionary in return */
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func parseRawQuery(qry string) (params map[string]string) {
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qryChunks := strings.Split(qry, "&")
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params = make(map[string]string, len(qryChunks))
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for _, chunk := range qryChunks {
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p := strings.SplitN(chunk, "=", 2)
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if (len(p) == 2) {
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params[p[0]] = p[1]
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}
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}
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return params
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}
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/* kindof a common log type output */
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func LogRequest(r *http.Request, statusCode int) {
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var addr string
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var user_agent string
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user_agent = ""
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addr = r.RemoteAddr
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for k, v := range r.Header {
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if k == "User-Agent" {
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user_agent = strings.Join(v, " ")
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}
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if k == "X-Forwarded-For" {
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addr = strings.Join(v," ")
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}
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}
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fmt.Printf("%s - - [%s] \"%s %s\" \"%s\" %d %d\n",
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addr,
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time.Now(),
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r.Method,
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r.URL.Path,
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user_agent,
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statusCode,
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r.ContentLength )
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}
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/*
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GET /f/
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GET /f/:name
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*/
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// Show a page of most recent images, and tags, and uploaders ...
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func routeFilesGET(w http.ResponseWriter, r *http.Request) {
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uriChunks := chunkURI(r.URL.Path)
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if ( len(uriChunks) > 2 ) {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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if (len(uriChunks) == 2 && len(uriChunks[1]) > 0) {
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log.Printf("Searching for [%s] ...", uriChunks[1])
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query := gfs.Find(bson.M{"filename": uriChunks[1] })
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c, err := query.Count()
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// preliminary checks, if they've passed an image name
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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log.Printf("Results for [%s] = %d", uriChunks[1], c)
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if (c == 0) {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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ext := filepath.Ext(uriChunks[1])
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w.Header().Set("Content-Type", mime.TypeByExtension(ext))
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w.Header().Set("Cache-Control", "max-age=315360000")
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w.WriteHeader(http.StatusOK)
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file, err := gfs.Open(uriChunks[1])
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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io.Copy(w,file) // send the contents of the file in the body
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} else {
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// TODO show a list of recent uploads? ...
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}
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LogRequest(r,200)
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}
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/*
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POST /f/[:name][?k=v&k=v]
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*/
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// Create the file by the name in the path and/or parameter?
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// add keywords from the parameters
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// look for an image in the r.Body
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func routeFilesPOST(w http.ResponseWriter, r *http.Request) {
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uriChunks := chunkURI(r.URL.Path)
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if (len(uriChunks) > 2 &&
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((len(uriChunks) == 2 && len(uriChunks[1]) == 0) &&
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len(r.URL.RawQuery) == 0 )) {
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LogRequest(r,403)
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http.Error(w, "Not Acceptable", 403)
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return
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}
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var filename string
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info := Info{
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Ip: r.RemoteAddr,
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Random: rand.Int63(),
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}
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if (len(uriChunks) == 2 && len(uriChunks[1]) != 0) {
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filename = uriChunks[1]
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}
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params := parseRawQuery(r.URL.RawQuery)
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var p_ext string
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for k,v := range params {
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switch {
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case (k == "filename"):
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filename = v
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case (k == "ext"):
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if (v[0] != '.') {
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p_ext = fmt.Sprintf(".%s", v)
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} else {
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p_ext = v
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}
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case (k == "k" || k == "key" || k == "keyword"):
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info.Keywords = append(info.Keywords[:], v)
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case (k == "keys" || k == "keywords"):
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for _, key := range strings.Split(v, ",") {
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info.Keywords = append(info.Keywords[:], key)
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}
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}
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}
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if (len(filename) == 0) {
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str := GetSmallHash()
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if (len(p_ext) == 0) {
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filename = fmt.Sprintf("%s.jpg", str)
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} else {
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filename = fmt.Sprintf("%s%s", str, p_ext)
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}
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}
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exists, err := HasFileByFilename(filename)
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if (err == nil && !exists) {
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file, err := gfs.Create(filename)
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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n, err := io.Copy(file, r.Body)
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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if (n != r.ContentLength) {
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log.Printf("WARNING: [%s] content-length (%d), content written (%d)",
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filename,
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r.ContentLength,
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n)
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}
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file.Close()
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} else if (exists) {
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log.Printf("[%s] already exists", filename)
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} else {
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serverErr(w,r,err)
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return
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}
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io.WriteString(w,
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fmt.Sprintf("%s%s/f/%s\n", r.URL.Scheme, r.URL.Host, filename))
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LogRequest(r,200)
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}
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func routeFilesPUT(w http.ResponseWriter, r *http.Request) {
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// update the file by the name in the path and/or parameter?
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// update/add keywords from the parameters
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// look for an image in the r.Body
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LogRequest(r,200)
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}
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func routeFilesDELETE(w http.ResponseWriter, r *http.Request) {
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uriChunks := chunkURI(r.URL.Path)
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if ( len(uriChunks) > 2 ) {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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} else if (len(uriChunks) == 2 && len(uriChunks[1]) == 0) {
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}
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exists, err := HasFileByFilename(uriChunks[1])
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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if (exists) {
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err = gfs.Remove(uriChunks[1])
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if (err != nil) {
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serverErr(w,r,err)
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return
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}
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LogRequest(r,200)
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} else {
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LogRequest(r,404)
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http.NotFound(w,r)
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}
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// delete the name in the path and/or parameter?
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}
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func routeFiles(w http.ResponseWriter, r *http.Request) {
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switch {
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case r.Method == "GET":
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routeFilesGET(w,r)
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case r.Method == "PUT":
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routeFilesPUT(w,r)
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case r.Method == "POST":
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routeFilesPOST(w,r)
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case r.Method == "DELETE":
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routeFilesDELETE(w,r)
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default:
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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}
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func routeRoot(w http.ResponseWriter, r *http.Request) {
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if (r.Method != "GET") {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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// Show a page of most recent images, and tags, and uploaders ...
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w.Header().Set("Content-Type", "text/html")
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//iter := gfs.Find(bson.M{"uploadDate": bson.M{"$gt": time.Now().Add(-time.Hour)}}).Limit(10).Iter()
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iter := gfs.Find(nil).Sort("-uploadDate").Limit(10).Iter()
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writeList(w, iter)
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LogRequest(r,200)
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}
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func routeAll(w http.ResponseWriter, r *http.Request) {
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if (r.Method != "GET") {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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w.Header().Set("Content-Type", "text/html")
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// Show a page of all the images
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iter := gfs.Find(nil).Iter()
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writeList(w, iter)
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LogRequest(r,200)
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}
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/*
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GET /k/
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GET /k/:name
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GET /k/:name/r
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Show a page of all the keyword tags, and then the images
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If /k/:name/r then show a random image by keyword name
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Otherwise 404
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*/
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func routeKeywords(w http.ResponseWriter, r *http.Request) {
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uriChunks := chunkURI(r.URL.Path)
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if (r.Method != "GET" ||
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len(uriChunks) > 3 ||
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(len(uriChunks) == 3 && uriChunks[2] != "r")) {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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log.Printf("K: %s (%d)", uriChunks, len(uriChunks))
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params := parseRawQuery(r.URL.RawQuery)
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log.Printf("K: params: %s", params)
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var iter *mgo.Iter
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if (len(uriChunks) == 1) {
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// show a sorted list of tag name links
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iter = gfs.Find(bson.M{"metadata": bson.M{"keywords": uriChunks[1] } }).Sort("$natural").Limit(100).Iter()
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} else if (len(uriChunks) == 2) {
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iter = gfs.Find(bson.M{"metadata": bson.M{"keywords": uriChunks[1] } }).Limit(10).Iter()
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} else if (uriChunks[2] == "r") {
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// TODO determine how to show a random image by keyword ...
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log.Println("random isn't built yet")
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LogRequest(r,404)
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return
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}
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writeList(w, iter)
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LogRequest(r,200)
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}
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func writeList(w http.ResponseWriter, iter *mgo.Iter) {
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var this_file File
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fmt.Fprintf(w, "<ul>\n")
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for iter.Next(&this_file) {
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log.Println(this_file.Filename)
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fmt.Fprintf(w, "<li>%s - %d</li>\n",
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linkToFile("", this_file.Filename),
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this_file.UploadDate.Year())
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}
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fmt.Fprintf(w, "</ul>\n")
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}
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// Show a page of all the uploader's IPs, and the images
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func routeExt(w http.ResponseWriter, r *http.Request) {
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if (r.Method != "GET") {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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LogRequest(r,200)
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}
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// Show a page of all the uploader's IPs, and the images
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func routeIPs(w http.ResponseWriter, r *http.Request) {
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if (r.Method != "GET") {
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LogRequest(r,404)
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http.NotFound(w,r)
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return
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}
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LogRequest(r,200)
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}
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func initMongo() {
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mongo_session, err := mgo.Dial(MongoHost)
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if err != nil {
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log.Panic(err)
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}
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images_db = mongo_session.DB(MongoDB)
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if (len(MongoUsername) > 0 && len(MongoPassword) > 0) {
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err = images_db.Login(MongoUsername, MongoPassword)
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if (err != nil) {
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log.Panic(err)
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}
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}
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gfs = images_db.GridFS("fs")
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}
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/* Run as the image server */
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func runServer(ip, port string) {
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var addr = fmt.Sprintf("%s:%s", ip, port)
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initMongo()
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defer mongo_session.Close()
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http.HandleFunc("/", routeRoot)
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http.HandleFunc("/all", routeAll)
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http.HandleFunc("/f/", routeFiles)
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http.HandleFunc("/k/", routeKeywords)
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http.HandleFunc("/ip/", routeIPs)
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http.HandleFunc("/ext/", routeExt)
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//http.HandleFunc("/md5/", routeMD5s)
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log.Printf("Serving on %s ...", addr)
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log.Fatal(http.ListenAndServe(addr, nil))
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}
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