feat: add cors headers

README.md

@@ -199,6 +199,31 @@ http:
   # Make sure to use https:// if you are using TLS.
   public_url: "http://localhost:23232"
 
+  # The cross-origin request security options
+  cors:
+    # The allowed cross-origin headers
+    allowed_headers:
+      - Accept
+      - Accept-Language
+      - Content-Language
+      - Origin
+    #  - Content-Type
+    #  - X-Requested-With
+    #  - User-Agent
+    #  - Authorization
+
+    # The allowed cross-origin URLs
+    # allowed_origins:
+    #    - *
+
+    # The allowed cross-origin methods
+    allowed_methods:
+       - GET
+       - HEAD
+       - POST
+    #   - PUT
+    #   - OPTIONS
+
 # The database configuration.
 db:
   # The database driver to use.

pkg/config/config.go

@@ -55,6 +55,15 @@ type GitConfig struct {
 	MaxConnections int `env:"MAX_CONNECTIONS" yaml:"max_connections"`
 }
 
+// CORSConfig is the CORS configuration for the server.
+type CORSConfig struct {
+	AllowedHeaders []string `env:"ALLOWED_HEADERS" yaml:"allowed_headers"`
+
+	AllowedOrigins []string `env:"ALLOWED_ORIGINS" yaml:"allowed_origins"`
+
+	AllowedMethods []string `env:"ALLOWED_METHODS" yaml:"allowed_methods"`
+}
+
 // HTTPConfig is the HTTP configuration for the server.
 type HTTPConfig struct {
 	// ListenAddr is the address on which the HTTP server will listen.
@@ -68,6 +77,9 @@ type HTTPConfig struct {
 
 	// PublicURL is the public URL of the HTTP server.
 	PublicURL string `env:"PUBLIC_URL" yaml:"public_url"`
+
+	// HTTP is the configuration for the HTTP server.
+	CORS CORSConfig `envPrefix:"CORS_" yaml:"cors"`
 }
 
 // StatsConfig is the configuration for the stats server.
@@ -180,6 +192,9 @@ func (c *Config) Environ() []string {
 		fmt.Sprintf("SOFT_SERVE_HTTP_TLS_KEY_PATH=%s", c.HTTP.TLSKeyPath),
 		fmt.Sprintf("SOFT_SERVE_HTTP_TLS_CERT_PATH=%s", c.HTTP.TLSCertPath),
 		fmt.Sprintf("SOFT_SERVE_HTTP_PUBLIC_URL=%s", c.HTTP.PublicURL),
+		fmt.Sprintf("SOFT_SERVE_HTTP_CORS_ALLOWED_HEADERS=%s", strings.Join(c.HTTP.CORS.AllowedHeaders, "\n")),
+		fmt.Sprintf("SOFT_SERVE_HTTP_CORS_ALLOWED_ORIGINS=%s", strings.Join(c.HTTP.CORS.AllowedOrigins, "\n")),
+		fmt.Sprintf("SOFT_SERVE_HTTP_CORS_ALLOWED_METHODS=%s", strings.Join(c.HTTP.CORS.AllowedMethods, "\n")),
 		fmt.Sprintf("SOFT_SERVE_STATS_LISTEN_ADDR=%s", c.Stats.ListenAddr),
 		fmt.Sprintf("SOFT_SERVE_LOG_FORMAT=%s", c.Log.Format),
 		fmt.Sprintf("SOFT_SERVE_LOG_TIME_FORMAT=%s", c.Log.TimeFormat),

pkg/web/server.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 
 	"github.com/charmbracelet/log"
+	"github.com/charmbracelet/soft-serve/pkg/config"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
 )
@@ -26,5 +27,12 @@ func NewRouter(ctx context.Context) http.Handler {
 	h = handlers.CompressHandler(h)
 	h = handlers.RecoveryHandler()(h)
 
+	cfg := config.FromContext(ctx)
+
+	h = handlers.CORS(handlers.AllowedHeaders(cfg.HTTP.CORS.AllowedHeaders),
+		handlers.AllowedOrigins(cfg.HTTP.CORS.AllowedOrigins),
+		handlers.AllowedMethods(cfg.HTTP.CORS.AllowedMethods),
+	)(h)
+
 	return h
 }