json-writer.yml

rules:
  - id: json-encoder-needs-type
    patterns:
                - pattern: |
                        $ENC := json.NewEncoder(($W: http.ResponseWriter))
                        ...
                        $ENC.Encode(...)
                - pattern-not: |
                        $ENC := json.NewEncoder(($W: http.ResponseWriter))
                        ...
                        $W.Header().Set("=~/Content-Type/i", "=~/application/json/")
                        ...
                        $ENC.Encode(...)
                - pattern-not-inside: |
                        $W.Header().Set("=~/Content-Type/i", "=~/application/json/")
                        ...
                        $ENC := json.NewEncoder($W)
                        ...
                        $ENC.Encode(...)
                - pattern-not: |
                        $ENC := json.NewEncoder(($W: http.ResponseWriter))
                        ...
                        $W.Header().Add("=~/Content-Type/i", "=~/application/json/")
                        ...
                        $ENC.Encode(...)
                - pattern-not-inside: |
                        $W.Header().Add("=~/Content-Type/i", "=~/application/json/")
                        ...
                        $ENC := json.NewEncoder($W)
                        ...
                        $ENC.Encode(...)

    message: "calling json.Encode() on an http.ResponseWriter will set Content-Type text/plain"
    languages: [go]
    severity: ERROR