83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package api
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import (
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"github.com/julienschmidt/httprouter"
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)
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type DispatchFunction func(httprouter.Params, []byte) (interface{}, error)
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func apiHandler(f DispatchFunction) 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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if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
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r.RemoteAddr = addr
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}
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log.Printf("%s \"%s %s\" [%s]\n", r.RemoteAddr, r.Method, r.URL.Path, r.UserAgent())
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// Read the body
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if r.ContentLength < 0 || r.ContentLength > 6553600 {
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http.Error(w, fmt.Sprintf("{errmsg:\"Request too large or request size unknown\"}"), http.StatusRequestEntityTooLarge)
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return
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}
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var body []byte
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if r.ContentLength > 0 {
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tmp := make([]byte, 1024)
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for {
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n, err := r.Body.Read(tmp)
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for j := 0; j < n; j++ {
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body = append(body, tmp[j])
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}
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if err != nil || n <= 0 {
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break
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}
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}
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}
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var ret interface{}
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var err error = nil
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ret, err = f(ps, body)
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// Format response
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resStatus := http.StatusOK
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if err != nil {
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ret = map[string]string{"errmsg": err.Error()}
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resStatus = http.StatusBadRequest
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log.Println(r.RemoteAddr, resStatus, err.Error())
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}
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if ret == nil {
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ret = map[string]string{"errmsg": "Page not found"}
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resStatus = http.StatusNotFound
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}
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if str, found := ret.(string); found {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(resStatus)
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io.WriteString(w, str)
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} else if bts, found := ret.([]byte); found {
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w.Header().Set("Content-Type", "application/octet-stream")
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w.Header().Set("Content-Disposition", "attachment")
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w.Header().Set("Content-Transfer-Encoding", "binary")
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w.WriteHeader(resStatus)
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w.Write(bts)
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} else if j, err := json.Marshal(ret); err != nil {
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w.Header().Set("Content-Type", "application/json")
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http.Error(w, fmt.Sprintf("{\"errmsg\":%q}", err), http.StatusInternalServerError)
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} else {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(resStatus)
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w.Write(j)
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}
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}
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}
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func notFound(ps httprouter.Params, _ []byte) (interface{}, error) {
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return nil, nil
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}
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