Api/v1/statuses (#11)

This PR adds:
Statuses

    New status creation.
    View existing status
    Delete a status
    Fave a status
    Unfave a status
    See who's faved a status

Media

    Upload media attachment and store/retrieve it
    Upload custom emoji and store/retrieve it

Fileserver

    Serve files from storage

Testing

    Test models, testrig -- run a GTS test instance and play around with it.

internal/storage/inmem.go

@@ -7,25 +7,49 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 )
 
+// NewInMem returns an in-memory implementation of the Storage interface.
+// This is good for testing and whatnot but ***SHOULD ABSOLUTELY NOT EVER
+// BE USED IN A PRODUCTION SETTING***, because A) everything will be wiped out
+// if you restart the server and B) if you store lots of images your RAM use
+// will absolutely go through the roof.
 func NewInMem(c *config.Config, log *logrus.Logger) (Storage, error) {
 	return &inMemStorage{
 		stored: make(map[string][]byte),
+		log:    log,
 	}, nil
 }
 
 type inMemStorage struct {
 	stored map[string][]byte
+	log    *logrus.Logger
 }
 
 func (s *inMemStorage) StoreFileAt(path string, data []byte) error {
+	l := s.log.WithField("func", "StoreFileAt")
+	l.Debugf("storing at path %s", path)
 	s.stored[path] = data
 	return nil
 }
 
 func (s *inMemStorage) RetrieveFileFrom(path string) ([]byte, error) {
+	l := s.log.WithField("func", "RetrieveFileFrom")
+	l.Debugf("retrieving from path %s", path)
 	d, ok := s.stored[path]
 	if !ok {
 		return nil, fmt.Errorf("no data found at path %s", path)
 	}
 	return d, nil
 }
+
+func (s *inMemStorage) ListKeys() ([]string, error) {
+	keys := []string{}
+	for k := range s.stored {
+		keys = append(keys, k)
+	}
+	return keys, nil
+}
+
+func (s *inMemStorage) RemoveFileAt(path string) error {
+	delete(s.stored, path)
+	return nil
+}