Request and response logger

Add plugin into traefik static configuration

experimental:
  plugins:
    traefik-middleware-request-logger:
      moduleName: "github.com/cookielab/traefik-middleware-request-logger"
      version: "v0.0.9"

Add plugin into traefik via dynamic configuration (kubernetes)

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
    name: my-traefik-middleware-request-logger
    namespace: my-namespace
spec:
    plugin:
        traefik-middleware-request-logger:
            ContentTypes:
                - application/json
            Limits:
                MaxBodySize: "1048576"
            RequestIDHeaderName: X-Request-ID
            SkipHeaders:
                - Authorization
            StatusCodes:
                - 200

Configuration: When logging to stdout or stderr only the LogTarget value can be stdout or stderr. When logging to url the LogTarget value must be url and the LogTargetUrl must be a valid url.

Example stdout:

---
ContentTypes: # log only these content types
  - application/json
Limits:
  MaxBodySize: 1048576 # max size of request/response body
RequestIDHeaderName: X-Request-ID # save uniq request id into this header
StatusCodes: # log only these status codes
  - 200
SkipHeaders:
  - Authorization
RedactBodyFields: # body fields whose values are replaced with "[REDACTED]"
  - password
  - token
LogTarget: stdout # or "stderr"

Body redaction is on by default: when RedactBodyFields is not set, a built-in list of sensitive field names is used (password, passwd, pwd, secret, client_secret, token, access_token, refresh_token, id_token, api_key, authorization, authorizationCode, and camelCase variants). Matching is case-insensitive and applies to JSON bodies (recursively) as well as bodies logged as plain strings ("field": "..." and field=... shapes). Set RedactBodyFields to override the list with your own.

Example url: Note: LogTarget value must be url in and the LogTargetUrl must be a valid url.

---
ContentTypes: # log only these content types
  - application/json
Limits:
  MaxBodySize: 1048576 # max size of request/response body
RequestIDHeaderName: X-Request-ID # save uniq request id into this header
StatusCodes: # log only these status codes
  - 200
SkipHeaders:
  - Authorization
LogTarget: url
LogTargetUrl: https://consumer.logs.example.com/input

Conditions use "AND" (all conditions must be true). When request or response size exeed limit, the info string is present.