dc4bc/client/http_server.go

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package client
import (
"encoding/json"
"fmt"
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"image"
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"io/ioutil"
"log"
"net/http"
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"github.com/depools/dc4bc/qr"
"github.com/depools/dc4bc/storage"
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)
func errorResponse(w http.ResponseWriter, statusCode int, err string) {
log.Println(err)
w.WriteHeader(statusCode)
if _, err := w.Write([]byte(err)); err != nil {
panic(fmt.Sprintf("failed to write response: %v", err))
}
}
func successResponse(w http.ResponseWriter, response []byte) {
if _, err := w.Write(response); err != nil {
panic(fmt.Sprintf("failed to write response: %v", err))
}
}
func (c *Client) StartHTTPServer(listenAddr string) error {
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mux := http.NewServeMux()
mux.HandleFunc("/sendMessage", c.sendMessageHandler)
mux.HandleFunc("/getOperations", c.getOperationsHandler)
mux.HandleFunc("/getOperationQRPath", c.getOperationQRPathHandler)
mux.HandleFunc("/readProcessedOperationFromCamera", c.readProcessedOperationFromCameraHandler)
mux.HandleFunc("/readProcessedOperation", c.readProcessedOperationFromBodyHandler)
mux.HandleFunc("/getOperationQR", c.getOperationQRToBodyHandler)
return http.ListenAndServe(listenAddr, mux)
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}
func (c *Client) sendMessageHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
reqBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
errorResponse(w, http.StatusBadRequest, fmt.Sprintf("failed to read request body: %v", err))
return
}
var msg storage.Message
if err = json.Unmarshal(reqBytes, &msg); err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to unmarshal message: %v", err))
return
}
if err = c.SendMessage(msg); err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to send message to the storage: %v", err))
return
}
successResponse(w, []byte("ok"))
}
func (c *Client) getOperationsHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
operations, err := c.GetOperations()
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to get operations: %v", err))
return
}
response, err := json.Marshal(operations)
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to marshal operations: %v", err))
return
}
successResponse(w, response)
}
func (c *Client) getOperationQRPathHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
operationID := r.URL.Query().Get("operationID")
qrPath, err := c.GetOperationQRPath(operationID)
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to get operation QR path: %v", err))
return
}
successResponse(w, []byte(qrPath))
}
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func (c *Client) getOperationQRToBodyHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
operationID := r.URL.Query().Get("operationID")
operationJSON, err := c.getOperationJSON(operationID)
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to get operation in JSON: %v", err))
return
}
encodedData, err := qr.EncodeQR(operationJSON)
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to encode operation: %v", err))
return
}
w.Header().Set("Content-Type", "image/jpeg")
w.Header().Set("Content-Length", fmt.Sprintf("%d", len(encodedData)))
successResponse(w, encodedData)
}
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func (c *Client) readProcessedOperationFromCameraHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
if err := c.ReadProcessedOperation(); err != nil {
errorResponse(w, http.StatusInternalServerError,
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fmt.Sprintf("failed to handle processed operation from camera path: %v", err))
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return
}
successResponse(w, []byte("ok"))
}
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func (c *Client) readProcessedOperationFromBodyHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
errorResponse(w, http.StatusBadRequest, "Wrong HTTP method")
return
}
if err := r.ParseMultipartForm(10 << 20); err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to parse multipat form: %v", err))
return
}
file, _, err := r.FormFile("qr")
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to retrieve a file: %v", err))
return
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to decode an image: %v", err))
return
}
qrData, err := qr.ReadDataFromQR(img)
if err != nil {
return
}
var operation Operation
if err = json.Unmarshal(qrData, &operation); err != nil {
errorResponse(w, http.StatusInternalServerError,
fmt.Sprintf("failed to unmarshal processed operation: %v", err))
return
}
if err := c.handleProcessedOperation(operation); err != nil {
errorResponse(w, http.StatusInternalServerError, fmt.Sprintf("failed to handle an operation: %v", err))
return
}
}