feat(api): add PATCH /users/@me, remove PATCH /users/@me/fields

backend/db/db.go

@@ -14,6 +14,8 @@ import (
 
 var sq = squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar)
 
+const ErrNothingToUpdate = errors.Sentinel("nothing to update")
+
 type DB struct {
 	*pgxpool.Pool
 

backend/db/field.go

@@ -91,13 +91,7 @@ func (db *DB) UserFields(ctx context.Context, id xid.ID) (fs []Field, err error)
 }
 
 // SetUserFields updates the fields for the given user.
-func (db *DB) SetUserFields(ctx context.Context, userID xid.ID, fields []Field) (err error) {
-	tx, err := db.Begin(ctx)
-	if err != nil {
-		return errors.Wrap(err, "building sql")
-	}
-	defer tx.Rollback(ctx)
-
+func (db *DB) SetUserFields(ctx context.Context, tx pgx.Tx, userID xid.ID, fields []Field) (err error) {
 	sql, args, err := sq.Delete("user_fields").Where("user_id = ?", userID).ToSql()
 	if err != nil {
 		return errors.Wrap(err, "building sql")
@@ -124,10 +118,5 @@ func (db *DB) SetUserFields(ctx context.Context, userID xid.ID, fields []Field)
 	if err != nil {
 		return errors.Wrap(err, "inserting new fields")
 	}
-
-	err = tx.Commit(ctx)
-	if err != nil {
-		return errors.Wrap(err, "committing transaction")
-	}
 	return nil
 }

backend/db/user.go

@@ -38,6 +38,14 @@ const (
 	ErrUsernameTooLong  = errors.Sentinel("username is too long")
 )
 
+const (
+	MaxUsernameLength    = 40
+	MaxDisplayNameLength = 100
+	MaxUserBioLength     = 1000
+	MaxUserLinksLength   = 25
+	MaxLinkLength        = 256
+)
+
 // CreateUser creates a user with the given username.
 func (db *DB) CreateUser(ctx context.Context, username string) (u User, err error) {
 	// check if the username is valid
@@ -146,3 +154,49 @@ func (db *DB) UsernameTaken(ctx context.Context, username string) (valid, taken
 	err = db.QueryRow(ctx, "select exists (select id from users where username = $1)", username).Scan(&taken)
 	return true, taken, err
 }
+
+func (db *DB) UpdateUser(
+	ctx context.Context,
+	tx pgx.Tx, id xid.ID,
+	displayName, bio *string,
+	links *[]string,
+) (u User, err error) {
+	if displayName == nil && bio == nil && links == nil {
+		return u, ErrNothingToUpdate
+	}
+
+	builder := sq.Update("users").Where("id = ?", id)
+	if displayName != nil {
+		if *displayName == "" {
+			builder = builder.Set("display_name", nil)
+		} else {
+			builder = builder.Set("display_name", *displayName)
+		}
+	}
+	if bio != nil {
+		if *bio == "" {
+			builder = builder.Set("bio", nil)
+		} else {
+			builder = builder.Set("bio", *bio)
+		}
+	}
+	if links != nil {
+		if len(*links) == 0 {
+			builder = builder.Set("links", nil)
+		} else {
+			builder = builder.Set("links", *links)
+		}
+	}
+
+	sql, args, err := builder.Suffix("RETURNING *").ToSql()
+	if err != nil {
+		return u, errors.Wrap(err, "building sql")
+	}
+
+	err = pgxscan.Get(ctx, tx, &u, sql, args...)
+	if err != nil {
+		return u, errors.Wrap(err, "executing sql")
+	}
+
+	return u, nil
+}