Added File model (still missing edit/remove), fixed uploading to space always failing, added /upload endpoint to rpdata-grapihql server

model/file/file.go

@@ -0,0 +1,138 @@
+package file
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/binary"
+	"io"
+	"strconv"
+	"time"
+
+	"git.aiterp.net/rpdata/api/internal/store"
+	"github.com/globalsign/mgo"
+	"github.com/globalsign/mgo/bson"
+)
+
+var fileCollection *mgo.Collection
+
+// A File is a record of a file stored in the Space.
+type File struct {
+	ID       string    `bson:"_id" json:"id"`
+	Time     time.Time `bson:"time" json:"time"`
+	Public   bool      `bson:"public" json:"public"`
+	Name     string    `bson:"name" json:"name"`
+	MimeType string    `bson:"mimeType" json:"mimeType"`
+	Size     int64     `bson:"size" json:"size"`
+	Author   string    `bson:"author" json:"author"`
+	URL      string    `bson:"url,omitempty" json:"url,omitempty"`
+}
+
+// Upload adds a file to the space.
+func Upload(ctx context.Context, name, mimeType, author string, size int64, input io.Reader) (File, error) {
+	if name == "" {
+		date := time.Now().UTC().Format("Jan 02 2006 15:04:05 MST")
+		name = "Unnamed file (" + date + ")"
+	}
+
+	if mimeType == "" {
+		mimeType = "binary/octet-stream"
+	}
+
+	id := makeFileID()
+
+	path, err := store.UploadFile(ctx, "files", id, mimeType, input, size)
+	if err != nil {
+		return File{}, err
+	}
+
+	file := File{
+		ID:       id,
+		Time:     time.Now(),
+		Public:   false,
+		Author:   author,
+		Name:     name,
+		MimeType: mimeType,
+		Size:     size,
+		URL:      store.URLFromPath(path),
+	}
+
+	err = fileCollection.Insert(file)
+	if err != nil {
+		return File{}, err
+	}
+
+	return file, nil
+}
+
+// FindID finds a file by ID
+func FindID(id string) (File, error) {
+	file := File{}
+
+	err := fileCollection.FindId(id).One(&file)
+	if err != nil {
+		return File{}, err
+	}
+
+	return file, nil
+}
+
+// ListFiles lists files according to the standard lookup. By default it's just the author's own files,
+// but if `public` is true it will alos include files made public by other authors. If `mimeTypes` contains
+// any, it will limit the results to that.
+func ListFiles(author string, public bool, mimeTypes []string) ([]File, error) {
+	query := bson.M{}
+
+	if public {
+		query["$or"] = []bson.M{
+			bson.M{"author": author},
+			bson.M{"public": true},
+		}
+	} else {
+		query["author"] = author
+	}
+
+	if len(mimeTypes) > 0 {
+		query["mimeTypes"] = bson.M{"$in": mimeTypes}
+	}
+
+	return listFiles(query)
+}
+
+func listFiles(query interface{}) ([]File, error) {
+	list := make([]File, 0, 32)
+
+	err := fileCollection.Find(query).All(&list)
+	if err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+// makeFileID makes a random file ID that's 32 characters long
+func makeFileID() string {
+	result := "F" + strconv.FormatInt(time.Now().UnixNano(), 36)
+	offset := 0
+	data := make([]byte, 32)
+
+	rand.Read(data)
+	for len(result) < 32 {
+		result += strconv.FormatUint(binary.LittleEndian.Uint64(data[offset:]), 36)
+		offset += 8
+
+		if offset >= 32 {
+			rand.Read(data)
+			offset = 0
+		}
+	}
+
+	return result[:32]
+}
+
+func init() {
+	store.HandleInit(func(db *mgo.Database) {
+		fileCollection = db.C("file.headers")
+
+		fileCollection.EnsureIndexKey("author")
+	})
+}