admin/api: use gorilla/mux instead of Go router

admin/api/file.go

@@ -0,0 +1,89 @@
+package api
+
+import (
+	"bufio"
+	"crypto/sha512"
+	"encoding/base32"
+	"encoding/json"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"strings"
+
+	"srs.epita.fr/fic-server/libfic"
+)
+
+var CloudDAVBase string
+var CloudUsername string
+var CloudPassword string
+
+func createExerciceFile(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
+	var uf map[string]string
+	if err := json.Unmarshal(body, &uf); err != nil {
+		return nil, err
+	}
+
+	var hash [sha512.Size]byte
+	var logStr string
+	var fromURI string
+	var getFile func(string) error
+
+	if URI, ok := uf["URI"]; ok {
+		hash = sha512.Sum512([]byte(URI))
+		logStr = "Import file from Cloud: " + URI + " =>"
+		fromURI = URI
+		getFile = func(dest string) error { return getCloudFile(URI, dest) }
+	} else if path, ok := uf["path"]; ok {
+		hash = sha512.Sum512([]byte(path))
+		logStr = "Import file from local FS: " + path + " =>"
+		fromURI = path
+		getFile = func(dest string) error { return os.Symlink(path, dest) }
+	} else {
+		return nil, errors.New("URI or path not filled")
+	}
+
+	pathname := path.Join(fic.FilesDir, strings.ToLower(base32.StdEncoding.EncodeToString(hash[:])), path.Base(fromURI))
+
+	if _, err := os.Stat(pathname); os.IsNotExist(err) {
+		log.Println(logStr, pathname)
+		if err := os.MkdirAll(path.Dir(pathname), 0777); err != nil {
+			return nil, err
+		} else if err := getFile(pathname); err != nil {
+			return nil, err
+		}
+	}
+
+	return exercice.ImportFile(pathname, fromURI)
+}
+
+func getCloudFile(pathname string, dest string) error {
+	client := http.Client{}
+	if req, err := http.NewRequest("GET", CloudDAVBase+pathname, nil); err != nil {
+		return err
+	} else {
+		req.SetBasicAuth(CloudUsername, CloudPassword)
+		if resp, err := client.Do(req); err != nil {
+			return err
+		} else {
+			defer resp.Body.Close()
+
+			if fd, err := os.Create(dest); err != nil {
+				return err
+			} else {
+				defer fd.Close()
+
+				if resp.StatusCode != http.StatusOK {
+					return errors.New(resp.Status)
+				} else {
+					writer := bufio.NewWriter(fd)
+					reader := bufio.NewReader(resp.Body)
+					reader.WriteTo(writer)
+					writer.Flush()
+				}
+			}
+		}
+	}
+	return nil
+}