Silverplate

Simple HTTP/S proxy server made with goproxy. Support for JSON-configurable rejecting rules.

Configuration

Silverplate comes with 2 JSON config file : config.json and rules.json. config.json is for general proxy configuration and rules.json is where you will be defining your rejecting rules. An example rule is already provided.

{
  "rules": [
    {
      "type": "DstHostIs",
      "value": "www.reddit.com",
      "conditions": {
        "hourRange": [9, 18]
      },
      "rejectMessage": "Not permitted during working hours",
      "httpStatusCode": 403
    }
  ]
}

config.json

Key	Description	Value type	Default value	Accepted value
verboseMode	Sets verbose mode. Verbose mode will print all requests output to the console.	boolean	true	true / false
keepDestinationHeaders	Whether or not the headers in the response should be kept before proxying.	boolean	true	true / false
keepHeader	Sets if proxy headers should be kept.	boolean	true	true / false
port	Port on which the proxy server will be started on.	number	3128	Any valid port number
handleNonProxyRequests	When set to true, all requests that cannot be proxied will be forwarded to a separate HTTP handler function and served as HTTP. Otherwise these requests are discarded.	boolean	true	true / false

rules.json

Key	Description	Value type
type	The type of rule on which to evaluate the value	RuleType
value	Value of the rule. This is dependent on the chosen type of rule. For example, for a DstHostIs rule, the value should be a valid FQDN.	string
conditions	Additionnal conditions to check in order to evaluate the rule to true	Condition[]
rejectMessage	The message displayed to the client if the request is rejected	string
httpStatusCode	The returned HTTP status code to set in the headers if the request is rejected	number

Types

RuleType

Rule	Description
UrlHasPrefix	Whether the URL has a prefix that matches [value]
UrlIs	The URL is a perfect match with [value]
ReqHostMatches	The request hostname matches [value]. Should be one or more regular expressions.
ReqHostIs	The request hostname is a perfect match with value [value]. Should be a string.
UrlMatches	The URL matches one or more regular expressions
DstHostIs	The destination FQDN is a perfect match with [value]
SrcIpIs	The source IP is a perfect match with [value]

Condition

Condition	Description	Value type
hourRange	Evaluates to true if the current hour is in range	number[]

License

Distributed under the MIT License. See LICENSE.txt for more information.