132 lines
3.0 KiB
Go
132 lines
3.0 KiB
Go
package contented
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import (
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"bytes"
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"encoding/json"
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"log"
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"net/http"
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"strings"
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"time"
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"github.com/boltdb/bolt"
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"github.com/mxk/go-flowrate/flowrate"
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)
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var SERVER_HEADER string = `contented/0.0.0-dev`
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type ServerPublicProperties struct {
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AppTitle string
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MaxUploadBytes int64
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}
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type ServerOptions struct {
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DataDirectory string
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DBPath string
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BandwidthLimit int64
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TrustXForwardedFor bool
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ServerPublicProperties
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}
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type Server struct {
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opts ServerOptions
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db *bolt.DB
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startTime time.Time
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metadataBucket []byte
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}
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func NewServer(opts *ServerOptions) (*Server, error) {
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s := &Server{
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opts: *opts,
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metadataBucket: []byte(`METADATA`),
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startTime: time.Now(),
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}
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b, err := bolt.Open(opts.DBPath, 0644, bolt.DefaultOptions)
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if err != nil {
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return nil, err
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}
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err = b.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucketIfNotExists(s.metadataBucket)
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return err
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})
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if err != nil {
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return nil, err
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}
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s.db = b
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return s, nil
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}
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func (this *Server) serveJsonObject(w http.ResponseWriter, o interface{}) {
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jb, err := json.Marshal(o)
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if err != nil {
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log.Println(err.Error())
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http.Error(w, "Internal error", 500)
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return
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}
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w.Header().Set(`Content-Type`, `application/json`)
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w.WriteHeader(200)
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w.Write(jb)
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}
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func (this *Server) handleAbout(w http.ResponseWriter) {
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this.serveJsonObject(w, this.opts.ServerPublicProperties)
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}
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func (this *Server) remoteIP(r *http.Request) string {
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if this.opts.TrustXForwardedFor {
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if xff := r.Header.Get("X-Forwarded-For"); len(xff) > 0 {
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return xff
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}
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}
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return strings.TrimRight(strings.TrimRight(r.RemoteAddr, "0123456789"), ":")
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}
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const (
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downloadUrlPrefix = `/get/`
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metadataUrlPrefix = `/info/`
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)
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func (this *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.Header().Set(`Server`, SERVER_HEADER)
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w.Header().Set(`Access-Control-Allow-Origin`, `*`) // Blanket allow CORS
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if this.opts.MaxUploadBytes > 0 {
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r.Body = http.MaxBytesReader(w, r.Body, this.opts.MaxUploadBytes)
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}
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if this.opts.BandwidthLimit > 0 {
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r.Body = flowrate.NewReader(r.Body, this.opts.BandwidthLimit)
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}
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//
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if r.Method == "GET" && strings.HasPrefix(r.URL.Path, downloadUrlPrefix) {
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this.handleView(w, r, r.URL.Path[len(downloadUrlPrefix):])
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} else if r.Method == "GET" && strings.HasPrefix(r.URL.Path, metadataUrlPrefix) {
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this.handleInformation(w, r.URL.Path[len(metadataUrlPrefix):])
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} else if r.Method == "GET" && r.URL.Path == `/about` {
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this.handleAbout(w)
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} else if r.Method == "POST" && r.URL.Path == `/upload` {
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this.handleUpload(w, r)
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} else if r.Method == "OPTIONS" {
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// Blanket allow (headers already set)
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w.WriteHeader(200)
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} else if r.Method == "GET" && r.URL.Path == `/` {
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http.Redirect(w, r, `/index.html`, http.StatusFound)
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} else if static, err := Asset(r.URL.Path[1:]); err == nil && r.Method == "GET" {
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http.ServeContent(w, r, r.URL.Path[1:], this.startTime, bytes.NewReader(static))
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} else {
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http.Error(w, "Not found", 404)
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}
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}
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