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image.go
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image.go
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package imageservice
import (
"encoding/json"
"errors"
"net/http"
"strconv"
"github.com/gorilla/mux"
"github.com/mistifyio/mistify-image-service/metadata"
)
// RegisterImageRoutes registers the image routes and handlers
func RegisterImageRoutes(prefix string, router *mux.Router) {
router.HandleFunc(prefix, listImagesHandler).Queries("type", "{imageType:[a-zA-Z]+}").Methods("GET")
router.HandleFunc(prefix, listImagesHandler).Methods("GET")
router.HandleFunc(prefix, receiveImageHandler).Methods("PUT")
router.HandleFunc(prefix, fetchImageHandler).Methods("POST")
sub := router.PathPrefix(prefix).Subrouter()
sub.HandleFunc("/{imageID}", getImageHandler).Methods("GET")
sub.HandleFunc("/{imageID}", deleteImageHandler).Methods("DELETE")
sub.HandleFunc("/{imageID}/download", downloadImageHandler).Methods("GET")
}
// listImagesHandler gets a list of images, optionally filtered by type
func listImagesHandler(w http.ResponseWriter, r *http.Request) {
hr := HTTPResponse{w}
ctx := GetContext(r)
vars := mux.Vars(r)
imageType := vars["imageType"]
if imageType != "" && !metadata.IsValidImageType(imageType) {
hr.JSONMsg(http.StatusBadRequest, "invalid type")
return
}
images, err := ctx.MetadataStore.List(imageType)
if err != nil {
hr.JSONError(http.StatusInternalServerError, err)
return
}
if images == nil {
images = make([]*metadata.Image, 0)
}
hr.JSON(http.StatusOK, images)
}
// receiveImageHandler adds and stores an image from the request body
func receiveImageHandler(w http.ResponseWriter, r *http.Request) {
hr := HTTPResponse{w}
ctx := GetContext(r)
imageType := r.Header.Get("X-Image-Type")
if !metadata.IsValidImageType(imageType) {
hr.JSONMsg(http.StatusBadRequest, "invalid X-Image-Type header")
return
}
image, err := ctx.Fetcher.Receive(r)
if err != nil {
hr.JSONError(http.StatusInternalServerError, err)
return
}
hr.JSON(http.StatusOK, image)
}
// fetchImageHandler asynchronously retrieves and adds an image to the system
// from an external source. If image has already been downloaded (same source),
// the existing image data will be returned. Getting the image information
// after a successful fetch has been initiated will show current download
// status.
func fetchImageHandler(w http.ResponseWriter, r *http.Request) {
hr := HTTPResponse{w}
ctx := GetContext(r)
image := &metadata.Image{}
if err := json.NewDecoder(r.Body).Decode(image); err != nil {
hr.JSONMsg(http.StatusBadRequest, err.Error())
return
}
image.ID = metadata.NewID()
// Ensure sufficient information for fetching
if image.Source == "" {
hr.JSONMsg(http.StatusBadRequest, "missing image source")
return
}
if !metadata.IsValidImageType(image.Type) {
hr.JSONMsg(http.StatusBadRequest, "invalid image type")
return
}
image, err := ctx.Fetcher.Fetch(image)
if err != nil {
hr.JSONError(http.StatusInternalServerError, err)
return
}
hr.JSON(http.StatusAccepted, image)
}
// getImageHandler retrieves information about an image.
func getImageHandler(w http.ResponseWriter, r *http.Request) {
hr := HTTPResponse{w}
image := getImage(w, r)
if image == nil {
return
}
hr.JSON(http.StatusOK, image)
}
// deleteImageHandler removes an image.
func deleteImageHandler(w http.ResponseWriter, r *http.Request) {
hr := HTTPResponse{w}
ctx := GetContext(r)
image := getImage(w, r)
if image == nil {
return
}
if err := ctx.ImageStore.Delete(image.ID); err != nil {
hr.JSONError(http.StatusInternalServerError, err)
return
}
if err := ctx.MetadataStore.Delete(image.ID); err != nil {
hr.JSONError(http.StatusInternalServerError, err)
return
}
hr.JSON(http.StatusOK, image)
}
// downloadImageHandler streams an image data
func downloadImageHandler(w http.ResponseWriter, r *http.Request) {
hr := &HTTPResponse{w}
ctx := GetContext(r)
image := getImage(w, r)
if image == nil {
return
}
if image.Status != metadata.StatusComplete {
hr.JSONError(http.StatusNotFound, errors.New("incomplete image"))
return
}
w.Header().Set("Content-Length", strconv.FormatInt(image.Size, 10))
w.Header().Set("Content-Type", "application/octet-stream")
if err := ctx.ImageStore.Get(image.ID, w); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func getImage(w http.ResponseWriter, r *http.Request) *metadata.Image {
hr := HTTPResponse{w}
ctx := GetContext(r)
vars := mux.Vars(r)
imageID := vars["imageID"]
image, err := ctx.MetadataStore.GetByID(imageID)
if err != nil {
code := http.StatusInternalServerError
if err == metadata.ErrNotFound {
code = http.StatusNotFound
}
hr.JSONError(code, err)
return nil
}
return image
}