Working auth and photo json endpoint

Signed-off-by: Kris Nóva <kris@nivenly.com>

vendor/github.com/dsoprea/go-utility/data/mime.go

@@ -0,0 +1,86 @@
+package ridata
+
+import (
+	"io"
+	"os"
+	"strings"
+
+	"net/http"
+
+	log "github.com/dsoprea/go-logging"
+)
+
+const (
+	// MimetypeLeadBytesCount is the number of bytes to use for detection.
+	MimetypeLeadBytesCount = 512
+)
+
+// GetMimetypeFromContent uses net/http to map from magic-bytes to mime-type.
+func GetMimetypeFromContent(r io.Reader, fileSize int64) (mimetype string, err error) {
+	defer func() {
+		if state := recover(); state != nil {
+			err = log.Wrap(state.(error))
+		}
+	}()
+
+	// TODO(dustin): !! Add test.
+
+	leadCount := int64(MimetypeLeadBytesCount)
+	if fileSize > 0 && fileSize < leadCount {
+		leadCount = fileSize
+	}
+
+	buffer := make([]byte, leadCount)
+
+	n, err := io.ReadFull(r, buffer)
+	if err != nil {
+		// We can return EOF if a) we weren't given a filesize and the file did
+		// not haveat least as many bytes as we check by default, or b) the file-
+		// size is actually (0).
+		if err == io.EOF {
+			return "", err
+		}
+
+		log.Panic(err)
+	}
+
+	buffer = buffer[:n]
+
+	// Always returns a valid mime-type.
+	contentType := http.DetectContentType(buffer)
+
+	contentType = strings.TrimRight(contentType, ";")
+
+	return contentType, nil
+}
+
+// DetectMimetype is a wrapper for GetMimetypeFromContent which returns the
+// mime-type for the given `File`. An empty-string is returned if it is a zero-
+// length file.
+func DetectMimetype(f *os.File) (mimetype string, err error) {
+	defer func() {
+		if state := recover(); state != nil {
+			err = log.Wrap(state.(error))
+		}
+	}()
+
+	originalOffsetRaw, err := f.Seek(0, os.SEEK_CUR)
+	log.PanicIf(err)
+
+	fi, err := f.Stat()
+	log.PanicIf(err)
+
+	fileSize := fi.Size()
+
+	if fileSize == 0 {
+		return "", nil
+	}
+
+	mimetype, err = GetMimetypeFromContent(f, fileSize)
+	log.PanicIf(err)
+
+	_, err = f.Seek(originalOffsetRaw, os.SEEK_SET)
+	log.PanicIf(err)
+
+	return mimetype, nil
+}