Generic functions

[aldas]

Add generic functions to get typed PathParam/QueryParam/FormParam values. Also *Or variants for default values.
Note: those who have forgotten - structs can not have generic methods. only generic functions are allowed.
Types that are supported:

• bool
• float32
• float64
• int
• int8
• int16
• int32
• int64
• uint
• uint8/byte
• uint16
• uint32
• uint64
• string
• echo.BindUnmarshaler interface
• encoding.TextUnmarshaler interface
• json.Unmarshaler interface
• time.Duration
• time.Time use echo.TimeOpts or echo.TimeLayout to set time parsing configuration

Scalar values:

• id, err := echo.PathParam[int](c, "id")
• id, err := echo.QueryParam[int](c, "id")
• id, err := echo.FormParam[int](c, "id")
• id, err := echo.PathParamOr[int](c, "id", -1)
• id, err := echo.QueryParamOr[int](c, "id", -1)
• id, err := echo.FormParamOr[int](c, "id", -1)

For getting slices:

• ids, err := echo.QueryParams[int](c, "id") returns []int
• ids, err := echo.FormParams[int](c, "id")

Generic parse functions:

• id, err := echo.ParseValue[int]("123")
• id, err := echo.ParseValueOr[int]("123",-1)
• ids, err := echo.ParseValues[int]([]string{"123", "124"})
• ids, err := echo.ParseValuesOr[int]([]string{"123", "124"}, []int{666})

Example

	e.GET(`/user/:id`, func(c echo.Context) error {
		id, err := echo.PathParam[int](c, "id")
		if err == nil {
			return err
		}
		return c.String(http.StatusOK, fmt.Sprintf("Hello %v\n", id))
	})

---

For Context.Get() generic versions

• v, err := ContextGetOr[int64](c, "key", 999)
• v, err := ContextGet[int64](c, "key")

Example with JWT middleware:

	e.Use(echojwt.JWT([]byte("secret")))

	e.GET(`/user/:id`, func(c echo.Context) error {
		token, err := echo.ContextGet[*jwt.Token](c, "user")
		if err == nil {
			return echo.ErrUnauthorized.WithInternal(err)
		}
		return c.String(http.StatusOK, fmt.Sprintf("Hello %v\n", token.Claims))
	})

[codecov]

Codecov Report

❌ Patch coverage is 90.10601% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.50%. Comparing base (f24aaff) to head (dd2e023).
⚠️ Report is 35 commits behind head on master.

Files with missing lines	Patch %	Lines
binder_generic.go	89.55%	16 Missing and 12 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2856      +/-   ##
==========================================
+ Coverage   93.25%   93.50%   +0.25%     
==========================================
  Files          39       42       +3     
  Lines        4652     4237     -415     
==========================================
- Hits         4338     3962     -376     
+ Misses        218      157      -61     
- Partials       96      118      +22     

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[aldas]

@vishr please review if you have time.