Assignment to entry in nil map with @Header all

[microphoneabuser]

Describe the bug
When using @Header all instead of explicitly writing response codes, panic occurs.

Code used:

// @Header all {string} X-Request-ID "Some description"

Result:

panic: assignment to entry in nil map
                                     
goroutine 1 running:

github.com/swaggo/swag.(*Operation).ParseResponseHeaderComment(0xc00030e120, {0xc0001ca00b, 0x84}, 0x91b134)
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/operation.go:897 +0x789         
github.com/swaggo/swag.(*Operation).ParseComment(0xc00030e120, {0xc0001ca000, 0x1}, 0x49d9fa)
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/operation.go:120 +0x287                         
github.com/swaggo/swag.(*Parser).ParseRouterAPIInfo(0xc0001b35f0, {0xc00052be00, 0x2d}, 0xc00002d500)
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/parser.go:695 +0x1b9
github.com/swaggo/swag.(*PackagesDefinitions).RangeFiles(0xc00000e960, 0xc00092f918)                
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/packages.go:88 +0x1ff             
github.com/swaggo/swag.(*Parser).ParseAPIMultiSearchDir(0xc0001b35f0, {0xc0001add20, 0x1, 0xc000072100}, {0x7ffe2ace2eea, 0x12}, 0x64)
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/parser.go:288 +0x325
github.com/swaggo/swag/gen.(*Gen).Build(0xc0001adc50, 0xc00092fc30)                                 
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/gen/gen.go:106 +0x2b0                              
main.initAction(0xc0001e21a0)                                                                       
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/cmd/swag/main.go:110 +0x39a
github.com/urfave/cli/v2.(*Command).Run(0xc0001937a0, 0xc0001d8380)
     /go/pkg/mod/github.com/urfave/cli/v2@v2.3.0/command.go:163 +0x64a
github.com/urfave/cli/v2.(*App).RunContext(0xc0001e2000, {0x9b56f0, 0xc000026038}, {0xc0000201e0, 0x6, 0x6})
     /go/pkg/mod/github.com/urfave/cli/v2@v2.3.0/app.go:313 +0x81e
github.com/urfave/cli/v2.(*App).Run(...)
     /go/pkg/mod/github.com/urfave/cli/v2@v2.3.0/app.go:224
main.main()
     /go/pkg/mod/github.com/swaggo/swag@v1.7.6/cmd/swag/main.go:174 +0x55d

But if i use: @Header 200,400,404,500 {string} X-Request-ID "Some description" it works fine.

The problem is in operation.go (*Operation).ParseResponseHeaderComment:

...
if strings.EqualFold(matches[1], "all") {
		if operation.Responses.Default != nil {
			operation.Responses.Default.Headers[headerKey] = header
		}

		if operation.Responses.StatusCodeResponses != nil {
			for code, response := range operation.Responses.StatusCodeResponses {
				response.Headers[headerKey] = header
				operation.Responses.StatusCodeResponses[code] = response
			}
		}

		return nil
	}
...

To fix it, we just need to initialize response.Headers before response.Headers[headerKey] = header :

...
if strings.EqualFold(matches[1], "all") {
		if operation.Responses.Default != nil {
			operation.Responses.Default.Headers[headerKey] = header
		}

		if operation.Responses.StatusCodeResponses != nil {
			for code, response := range operation.Responses.StatusCodeResponses {
				response.Headers = make(map[string]spec.Header)
				response.Headers[headerKey] = header
				operation.Responses.StatusCodeResponses[code] = response
			}
		}

		return nil
	}
...

To Reproduce
Use @Header all

[ubogdan]

This should be fixed in here #1066, and it will go with the next release (a few days far away).

Please build swag using the latest version from master and let us know.

[ubogdan]

@microphoneabuser any updates here?

[microphoneabuser]

@ubogdan No, panic still occurs.

[ubogdan]

@microphoneabuser this has been fixed and released with v1.7.7.
Please retest and let us know.

[microphoneabuser]

@ubogdan It's working fine now, thank you! :)