add Context.SetVersion helper

Former-commit-id: 605d6c1e78f73b8f2c89bd2dc7ee23f21551d47b

HISTORY.md

@@ -394,6 +394,7 @@ Other Improvements:
 
 New Context Methods:
 
+- `Context.SetVersion(constraint string)` force-sets an [API Version](https://github.com/kataras/iris/wiki/API-versioning)
 - `Context.SetLanguage(langCode string)` force-sets a language code from inside a middleare, similar to the `app.I18n.ExtractFunc`
 - `Context.ServeContentWithRate`, `ServeFileWithRate` and `SendFileWithRate` methods to throttle the "download" speed of the client
 - `Context.IsHTTP2() bool` reports whether the protocol version for incoming request was HTTP/2
@@ -416,6 +417,7 @@ New Context Methods:
 
 Breaking Changes:
 
+- `versioning.GetVersion` now returns an empty string if version wasn't found.
 - Change the MIME type of `Javascript .js` and `JSONP` as the HTML specification now recommends to `"text/javascript"` instead of the obselete `"application/javascript"`. This change was pushed to the `Go` language itself as well. See <https://go-review.googlesource.com/c/go/+/186927/>.
 - Remove the last input argument of `enableGzipCompression` in `Context.ServeContent`, `ServeFile` methods. This was deprecated a few versions ago. A middleware (`app.Use(iris.Gzip)`) or a prior call to `Context.Gzip(true)` will enable gzip compression. Also these two methods and `Context.SendFile` one now support `Content-Range` and `Accept-Ranges` correctly out of the box (`net/http` had a bug, which is now fixed).
 - `Context.ServeContent` no longer returns an error, see `ServeContentWithRate`, `ServeFileWithRate` and `SendFileWithRate` new methods too.

configuration.go

@@ -856,6 +856,10 @@ type Configuration struct {
 	// See `i18n.ExtractFunc` for a more organised way of the same feature.
 	// Defaults to "iris.locale.language".
 	LanguageContextKey string `json:"languageContextKey,omitempty" yaml:"LanguageContextKey" toml:"LanguageContextKey"`
+	// VersionContextKey is the context key which an API Version can be modified
+	// via a middleware through `SetVersion` method, e.g. `ctx.SetVersion("1.0, 1.1")`.
+	// Defauls to "iris.api.version".
+	VersionContextKey string `json:"versionContextKey" yaml:"VersionContextKey" toml:"VersionContextKey"`
 	// GetViewLayoutContextKey is the key of the context's user values' key
 	// which is being used to set the template
 	// layout from a middleware or the main handler.
@@ -1014,6 +1018,12 @@ func (c Configuration) GetLanguageContextKey() string {
 	return c.LanguageContextKey
 }
 
+// GetVersionContextKey returns the configuration's VersionContextKey value,
+// used for API Versioning.
+func (c Configuration) GetVersionContextKey() string {
+	return c.VersionContextKey
+}
+
 // GetViewLayoutContextKey returns the key of the context's user values' key
 // which is being used to set the template
 // layout from a middleware or the main handler.
@@ -1152,6 +1162,10 @@ func WithConfiguration(c Configuration) Configurator {
 			main.LanguageContextKey = v
 		}
 
+		if v := c.VersionContextKey; v != "" {
+			main.VersionContextKey = v
+		}
+
 		if v := c.ViewLayoutContextKey; v != "" {
 			main.ViewLayoutContextKey = v
 		}
@@ -1206,6 +1220,7 @@ func DefaultConfiguration() Configuration {
 		PostMaxMemory:            32 << 20, // 32MB
 		LocaleContextKey:         "iris.locale",
 		LanguageContextKey:       "iris.locale.language",
+		VersionContextKey:        "iris.api.version",
 		ViewLayoutContextKey:     "iris.viewLayout",
 		ViewDataContextKey:       "iris.viewData",
 		RemoteAddrHeaders:        make(map[string]bool),

context/configuration.go

@@ -81,7 +81,9 @@ type ConfigurationReadOnly interface {
 	// GetLanguageContextKey returns the configuration's LanguageContextKey value,
 	// used for i18n. Defaults to "iris.locale.language".
 	GetLanguageContextKey() string
-
+	// GetVersionContextKey returns the configuration's VersionKey value,
+	// used for API Versioning. Defaults to "iris.api.version".
+	GetVersionContextKey() string
 	// GetViewLayoutContextKey returns the key of the context's user values' key
 	// which is being used to set the template
 	// layout from a middleware or the main handler.

context/context.go

@@ -424,7 +424,9 @@ type Context interface {
 	// See `GetLocale` too.
 	// Example: https://github.com/kataras/iris/tree/master/_examples/i18n
 	Tr(format string, args ...interface{}) string
-
+	// SetVersion force-sets the API Version integrated with the "iris/versioning" subpackage.
+	// It can be used inside a middleare.
+	SetVersion(constraint string)
 	//  +------------------------------------------------------------+
 	//  | Headers helpers                                            |
 	//  +------------------------------------------------------------+
@@ -2025,6 +2027,12 @@ func (ctx *context) Tr(format string, args ...interface{}) string { // other nam
 	return fmt.Sprintf(format, args...)
 }
 
+// SetVersion force-sets the API Version integrated with the "iris/versioning" subpackage.
+// It can be used inside a middleare.
+func (ctx *context) SetVersion(constraint string) {
+	ctx.Values().Set(ctx.Application().ConfigurationReadOnly().GetVersionContextKey(), constraint)
+}
+
 //  +------------------------------------------------------------+
 //  | Response Headers helpers                                   |
 //  +------------------------------------------------------------+

versioning/version.go

@@ -21,10 +21,12 @@ const (
 	// 	ctx.Values().Set(versioning.Key, ctx.URLParamDefault("version", "1"))
 	// 	ctx.Next()
 	// }
-	Key = "iris.api.version" // for use inside the ctx.Values(), not visible by the user.
+	//
-	// NotFound is the key that can be used inside a `Map` or inside `ctx.Values().Set(versioning.Key, versioning.NotFound)`
+	// DEPRECATED: May 06 2020: Use `ctx.SetVersion(ctx.URLParamDefault("version", "1"))` instead.
+	Key = "iris.api.version"
+	// NotFound is the key that can be used inside a `Map` or inside `ctx.SetVersion(versioning.NotFound)`
 	// to tell that a version wasn't found, therefore the not found handler should handle the request instead.
-	NotFound = Key + ".notfound"
+	NotFound = "iris.api.version.notfound"
 )
 
 // NotFoundHandler is the default version not found handler that
@@ -55,13 +57,14 @@ var NotFoundHandler = func(ctx context.Context) {
 // However, the end developer can also set a custom version for a handler via a middleware by using the context's store key
 // for versions (see `Key` for further details on that).
 func GetVersion(ctx context.Context) string {
-	// firstly by context store, if manually set-ed by a middleware.
+	// firstly by context store, if manually set by a middleware.
-	if version := ctx.Values().GetString(Key); version != "" {
+	version := ctx.Values().GetString(ctx.Application().ConfigurationReadOnly().GetVersionContextKey())
+	if version != "" {
 		return version
 	}
 
 	// secondly by the "Accept-Version" header.
-	if version := ctx.GetHeader(AcceptVersionHeaderKey); version != "" {
+	if version = ctx.GetHeader(AcceptVersionHeaderKey); version != "" {
 		return version
 	}
 
@@ -72,7 +75,7 @@ func GetVersion(ctx context.Context) string {
 			rem := acceptValue[idx:]
 			startVersion := strings.Index(rem, "=")
 			if startVersion == -1 || len(rem) < startVersion+1 {
-				return NotFound
+				return ""
 			}
 
 			rem = rem[startVersion+1:]
@@ -85,11 +88,11 @@ func GetVersion(ctx context.Context) string {
 				end = len(rem)
 			}
 
-			if version := rem[:end]; version != "" {
+			if version = rem[:end]; version != "" {
 				return version
 			}
 		}
 	}
 
-	return NotFound
+	return ""
 }

versioning/version_test.go

@@ -17,7 +17,7 @@ func TestGetVersion(t *testing.T) {
 
 	app.Get("/", writeVesion)
 	app.Get("/manual", func(ctx iris.Context) {
-		ctx.Values().Set(versioning.Key, "11.0.5")
+		ctx.SetVersion("11.0.5")
 		ctx.Next()
 	}, writeVesion)
 
@@ -36,13 +36,13 @@ func TestGetVersion(t *testing.T) {
 
 	// unknown versions.
 	e.GET("/").WithHeader(versioning.AcceptVersionHeaderKey, "").Expect().
-		Status(iris.StatusOK).Body().Equal(versioning.NotFound)
+		Status(iris.StatusOK).Body().Equal("")
 	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version=").Expect().
-		Status(iris.StatusOK).Body().Equal(versioning.NotFound)
+		Status(iris.StatusOK).Body().Equal("")
 	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "application/vnd.api+json; version= ;other=dsa").Expect().
-		Status(iris.StatusOK).Body().Equal(versioning.NotFound)
+		Status(iris.StatusOK).Body().Equal("")
 	e.GET("/").WithHeader(versioning.AcceptHeaderKey, "version=").Expect().
-		Status(iris.StatusOK).Body().Equal(versioning.NotFound)
+		Status(iris.StatusOK).Body().Equal("")
 
 	e.GET("/manual").Expect().Status(iris.StatusOK).Body().Equal("11.0.5")
 }

versioning/versioning.go

@@ -43,7 +43,7 @@ func NewMatcher(versions Map) context.Handler {
 
 	return func(ctx context.Context) {
 		versionString := GetVersion(ctx)
-		if versionString == NotFound {
+		if versionString == "" || versionString == NotFound {
 			notFoundHandler(ctx)
 			return
 		}
@@ -63,7 +63,7 @@ func NewMatcher(versions Map) context.Handler {
 		}
 
 		// pass the not matched version so the not found handler can have knowedge about it.
-		// ctx.Values().Set(Key, versionString)
+		// ctx.SetVersion(versionString)
 		// or let a manual cal of GetVersion(ctx) do that instead.
 		notFoundHandler(ctx)
 	}