├── .gitignore ├── .travis.yml ├── LICENSE ├── Makefile ├── README.md ├── kong-dynamic-upstream-0.1.2-0.rockspec ├── spec └── access_spec.lua └── src ├── access.lua ├── handler.lua └── schema.lua /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Lua sources 2 | luac.out 3 | 4 | # luarocks build files 5 | *.src.rock 6 | *.zip 7 | *.tar.gz 8 | 9 | # Object files 10 | *.o 11 | *.os 12 | *.ko 13 | *.obj 14 | *.elf 15 | 16 | # Precompiled Headers 17 | *.gch 18 | *.pch 19 | 20 | # Libraries 21 | *.lib 22 | *.a 23 | *.la 24 | *.lo 25 | *.def 26 | *.exp 27 | 28 | # Shared objects (inc. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | DEV_ROCKS = busted luacheck 2 | 3 | .PHONY: install dev clean doc lint test coverage 4 | 5 | install: 6 | luarocks make kong-dynamic-upstream-*.rockspec \ 7 | 8 | dev: install 9 | @for rock in $(DEV_ROCKS) ; do \ 10 | if ! command -v $$rock > /dev/null ; then \ 11 | echo $$rock not found, installing via luarocks... ; \ 12 | luarocks install $$rock ; \ 13 | else \ 14 | echo $$rock already installed, skipping ; \ 15 | fi \ 16 | done; 17 | 18 | lint: 19 | @luacheck -q src \ 20 | --std 'busted' \ 21 | --globals 'require' \ 22 | --globals 'ngx' \ 23 | --no-redefined \ 24 | --no-unused-args 25 | 26 | test: 27 | @busted -v spec 28 | 29 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | [![Build Status](https://travis-ci.org/nvmlabs/kong-dynamic-upstream.svg?branch=master)](https://travis-ci.org/nvmlabs/kong-dynamic-upstream) 2 | 3 | # kong-dynamic-upstream 4 | A Kong plugin that sets different upstream URLs based on API and Consumer. 5 | 6 | The path of the user's request to the API will be appended to the end of the replacement URL. 7 | The ```strip_request_path``` parameter will be respected. 8 | 9 | A request to an API at /foo that is set to strip the request path, [http://kong/foo/bar](http://kong/foo/bar), 10 | by a consumer with the ```dynamic-upstream``` plugin configured with a ```replacement_url``` of [https://snafu:4242](https://snafu:4242) 11 | will be directed to [https://snafu:4242/bar](https://snafu:4242/bar). 12 | 13 | The replacement URL must contain: 14 | - a scheme, eg. _HTTPS_ 15 | - a hostname, eg. _mockbin.com_ 16 | 17 | Optionally you can include: 18 | - a port, eg. _:8080_ 19 | - a path, eg. _/path_ 20 | 21 | Any existing path in the upstream_url configured for the API will not be replaced by the plugin. For example, an API with an upstream_url of http://www.google.com/foo and a dynamic-upstream plugin with a replacement_url of http://mockbin.com/bin/1234 will route consumers to http://mockbin.com/bin/1234/foo{request_path}. 22 | 23 | Some usage examples of valid replacement URLs: 24 | - [http://localhost:8081/](http://localhost:8081/) 25 | - https://mockbin.org/bin/e5d28230-7462-46cb-8c90-58784104bc1d 26 | 27 | --- 28 | 29 | ## Installation 30 | Clone the repository, navigate to the root folder and run: 31 | ``` 32 | make install 33 | ``` 34 | 35 | Edit your ```kong.yaml``` to include the plugin like so: 36 | ```yaml 37 | custom_plugins: 38 | - dynamic-upstream 39 | ``` 40 | 41 | Restart Kong. 42 | 43 | ## Development 44 | For a detailed guide on Kong plugin development, check out the official documentation 45 | at https://getkong.org/docs/0.8.x/plugin-development/. 46 | 47 | This plugin requires Lua 5.1 and the associated version of luarocks. Once you have these installed, 48 | to get the development dependencies run the following command: 49 | 50 | ``` 51 | make dev 52 | ``` 53 | 54 | ## Configuration 55 | This plugin can work when attached to All Consumers but really only makes sense when added to a specific Consumer to an API. You can add this plugin to an API and Consumer by making the following request to your Kong server: 56 | 57 | ```bash 58 | $ curl -X POST http://kong:8001/apis/{api}/plugins \ 59 | --data "name=dynamic-upstream" \ 60 | --data "consumer_id=6e62b030-c931-4c72-a012-6be18df81d49" \ 61 | --data "config.replacement_url=http://newupstream:4353/path" 62 | ``` 63 | 64 | ```api:``` The ```id``` or ```name``` of the API that this plugin configuration will target 65 | 66 | | Form Parameter | Required | Description | 67 | | --------------:| ----------- | ----------- | 68 | | ```name``` | *required* | The name of the plugin to use, in this case: ```dynamic-upstream``` | 69 | | ```consumer_id``` | *optional* | The id of the Consumer to redirect | 70 | | ```config.replacement_url``` | *required* | The URL to replace the default upstream specified in the API | 71 | 72 | 73 | ## Usage Examples 74 | This table details the expected behaviour of the plugin for most of the possible combinations of API and dynamic-upstream plugin configurations. 75 | 76 | | API upstream_url | API request_path | strip_request_path | Requested Path | dynamic-upstream replacement_url | Upstream | 77 | | ------------------------ | ---------------- | ------------------ | -------------- | -------------------------------- | ------------------------------------------- | 78 | | http://google.com | /foo | true | /foo | https://localhost:9999 | https://localhost:9999 | 79 | | http://google.com | /foo | false | /foo | https://localhost:9999 | https://localhost:9999/foo | 80 | | http://google.com | /foo | true | /foo/bar | https://localhost:9999 | https://localhost:9999/bar | 81 | | http://google.com | /foo | false | /foo/bar | https://localhost:9999 | https://localhost:9999/foo/bar | 82 | | http://google.com | /foo | true | /foo | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234 | 83 | | http://google.com | /foo | false | /foo | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/foo | 84 | | http://google.com | /foo | true | /foo/bar | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/bar | 85 | | http://google.com | /foo | false | /foo/bar | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/foo/bar | 86 | | http://google.com/teapot | /foo | true | /foo | https://localhost:9999 | https://localhost:9999/teapot | 87 | | http://google.com/teapot | /foo | false | /foo | https://localhost:9999 | https://localhost:9999/teapot/foo | 88 | | http://google.com/teapot | /foo | true | /foo/bar | https://localhost:9999 | https://localhost:9999/teapot/bar | 89 | | http://google.com/teapot | /foo | false | /foo/bar | https://localhost:9999 | https://localhost:9999/teapot/foo/bar | 90 | | http://google.com/teapot | /foo | true | /foo | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/teapot | 91 | | http://google.com/teapot | /foo | false | /foo | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/teapot/foo | 92 | | http://google.com/teapot | /foo | true | /foo/bar | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/teapot/bar | 93 | | http://google.com/teapot | /foo | false | /foo/bar | https://mockbin.com/bin/1234 | https://mockbin.com/bin/1234/teapot/foo/bar | 94 | -------------------------------------------------------------------------------- /kong-dynamic-upstream-0.1.2-0.rockspec: -------------------------------------------------------------------------------- 1 | package = "kong-dynamic-upstream" 2 | version = "0.1.2-0" 3 | source = { 4 | url = "git://github.com/nvmlabs/kong-dynamic-upstream" 5 | } 6 | description = { 7 | summary = "A Kong plugin that sets different upstream URLs based on API and Consumer", 8 | license = "Apache 2.0" 9 | } 10 | dependencies = { 11 | "lua ~> 5.1", 12 | "net-url ~> 0.9-1" 13 | } 14 | build = { 15 | type = "builtin", 16 | modules = { 17 | ["kong.plugins.dynamic-upstream.handler"] = "src/handler.lua", 18 | ["kong.plugins.dynamic-upstream.access"] = "src/access.lua", 19 | ["kong.plugins.dynamic-upstream.schema"] = "src/schema.lua" 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /spec/access_spec.lua: -------------------------------------------------------------------------------- 1 | local access = require "../src/access" 2 | 3 | describe ("access" , function () 4 | 5 | setup(function() 6 | _G.hostHeader = "" 7 | _G.ngx = {} 8 | _G.ngx.req = {} 9 | function ngx.req.set_header (name, value) 10 | if name == "host" then 11 | hostHeader = value 12 | end 13 | end 14 | _G.ngx.var = {} 15 | _G.ngx.ctx = {} 16 | end) 17 | 18 | it ("should replace the url", function() 19 | ngx.ctx.upstream_url = "https://google.com/path" 20 | local conf = {} 21 | conf.replacement_url = "http://mockbin.com:8000" 22 | 23 | access.execute(conf) 24 | assert.equal("http://mockbin.com:8000/path", ngx.ctx.upstream_url) 25 | end) 26 | 27 | it ("should update the Host header", function() 28 | ngx.ctx.upstream_url = "https://google.com/path" 29 | ngx.var.upstream_host = "google.com" 30 | local conf = {} 31 | conf.replacement_url = "http://www.mockbin.com:8000/api" 32 | 33 | access.execute(conf) 34 | assert.equal("www.mockbin.com:8000", ngx.var.upstream_host) 35 | assert.equal("www.mockbin.com:8000", hostHeader) 36 | end) 37 | 38 | it ("should maintain the query parameters", function() 39 | ngx.ctx.upstream_url = "https://google.com/?key=value&key2=value2" 40 | local conf = {} 41 | conf.replacement_url = "http://mockbin.com:8000" 42 | 43 | access.execute(conf) 44 | assert.equal("http://mockbin.com:8000/?key=value&key2=value2", ngx.ctx.upstream_url) 45 | end) 46 | 47 | it ("should maintain the fragment identifier", function() 48 | ngx.ctx.upstream_url = "https://google.com/path#top" 49 | local conf = {} 50 | conf.replacement_url = "http://mockbin.com:8000" 51 | 52 | access.execute(conf) 53 | assert.equal("http://mockbin.com:8000/path#top", ngx.ctx.upstream_url) 54 | end) 55 | 56 | it ("should numbers in the path", function() 57 | ngx.ctx.upstream_url = "https://google.com:8080/1234" 58 | local conf = {} 59 | conf.replacement_url = "http://mockbin.com" 60 | 61 | access.execute(conf) 62 | assert.equal("http://mockbin.com/1234", ngx.ctx.upstream_url) 63 | end) 64 | 65 | it ("should include the path from the replacement url", function() 66 | ngx.ctx.upstream_url = "https://google.com:8080/1234" 67 | local conf = {} 68 | conf.replacement_url = "http://mockbin.com/5678" 69 | 70 | access.execute(conf) 71 | assert.equal("http://mockbin.com/5678/1234", ngx.ctx.upstream_url) 72 | end) 73 | 74 | it ("should ignore trailing slashes on the replacement url", function() 75 | ngx.ctx.upstream_url = "https://google.com:8080/1234" 76 | local conf = {} 77 | conf.replacement_url = "http://mockbin.com/5678/" 78 | 79 | access.execute(conf) 80 | assert.equal("http://mockbin.com/5678/1234", ngx.ctx.upstream_url) 81 | end) 82 | 83 | it ("should ensure that the result has a slash if theres no path", function() 84 | ngx.ctx.upstream_url = "https://google.com:8080" 85 | local conf = {} 86 | conf.replacement_url = "http://mockbin.com" 87 | 88 | access.execute(conf) 89 | assert.equal("http://mockbin.com/", ngx.ctx.upstream_url) 90 | end) 91 | 92 | describe ("with just the replacement_url having a trailing slash" , function () 93 | it ("should ensure that the result has only one ending slash", function() 94 | ngx.ctx.upstream_url = "https://google.com:8080" 95 | local conf = {} 96 | conf.replacement_url = "http://mockbin.com/" 97 | 98 | access.execute(conf) 99 | assert.equal("http://mockbin.com/", ngx.ctx.upstream_url) 100 | end) 101 | end) 102 | 103 | describe ("with just the upstream_url having a trailing slash" , function () 104 | it ("should ensure that the result has only one ending slash", function() 105 | ngx.ctx.upstream_url = "https://google.com:8080/" 106 | local conf = {} 107 | conf.replacement_url = "http://mockbin.com" 108 | 109 | access.execute(conf) 110 | assert.equal("http://mockbin.com/", ngx.ctx.upstream_url) 111 | end) 112 | end) 113 | 114 | describe ("with both upstream_url and replacement_url having trailing slashes" , function () 115 | it ("should ensure that the result has only one ending slash", function() 116 | ngx.ctx.upstream_url = "https://google.com:8080/" 117 | local conf = {} 118 | conf.replacement_url = "http://mockbin.com/" 119 | 120 | access.execute(conf) 121 | assert.equal("http://mockbin.com/", ngx.ctx.upstream_url) 122 | end) 123 | end) 124 | end) 125 | -------------------------------------------------------------------------------- /src/access.lua: -------------------------------------------------------------------------------- 1 | local url = require "net.url" 2 | 3 | local _M = {} 4 | 5 | local function buildHostHeader(newHost) 6 | local u = url.parse(newHost) 7 | local hostHeader = u.host 8 | if u.port then 9 | hostHeader = hostHeader .. ":" .. u.port 10 | end 11 | return hostHeader 12 | end 13 | 14 | local function replaceHost(url, newHost) 15 | local pathIndex = url:find('[^/]/[^/]') 16 | 17 | if not pathIndex then 18 | if newHost:find('[^/]/[^/]') == nil and newHost:sub(#newHost) ~= "/" then 19 | return newHost .. "/" 20 | end 21 | 22 | return newHost 23 | end 24 | 25 | if newHost:sub(#newHost) == "/" then 26 | newHost = newHost:sub(1, -2) 27 | end 28 | 29 | local path = url:sub(pathIndex + 1) 30 | return newHost .. path 31 | end 32 | 33 | function _M.execute(conf) 34 | local hostHeader = buildHostHeader(conf.replacement_url) 35 | ngx.req.set_header("host", hostHeader) 36 | ngx.var.upstream_host = hostHeader 37 | ngx.ctx.upstream_url = replaceHost(ngx.ctx.upstream_url, conf.replacement_url) 38 | end 39 | 40 | return _M 41 | -------------------------------------------------------------------------------- /src/handler.lua: -------------------------------------------------------------------------------- 1 | local BasePlugin = require "kong.plugins.base_plugin" 2 | local access = require "kong.plugins.dynamic-upstream.access" 3 | local DynamicUpstreamHandler = BasePlugin:extend() 4 | 5 | DynamicUpstreamHandler.PRIORITY = 10 6 | 7 | function DynamicUpstreamHandler:new() 8 | DynamicUpstreamHandler.super.new(self, "dynamic-upstream") 9 | end 10 | 11 | function DynamicUpstreamHandler:access(conf) 12 | DynamicUpstreamHandler.super.access(self) 13 | access.execute(conf) 14 | end 15 | 16 | return DynamicUpstreamHandler 17 | -------------------------------------------------------------------------------- /src/schema.lua: -------------------------------------------------------------------------------- 1 | return { 2 | fields = { 3 | replacement_url = { required = true, type = "url" } 4 | } 5 | } 6 | --------------------------------------------------------------------------------