[mod] modified readme to include query string support

- considered experimental until more test coverage is done

README.md

@@ -4,7 +4,7 @@
 	A simplistic Dynamic DNS-ish server.
 </h4>
 
-`rynDNS` is a simple REST-API for `name` to `ip` resolving in the spirit of Dynamic DNS. Clients can `PUT` their `ipv4` address up to be read by other clients. Access is controlled via `api_key` and permissions (`read`, `write`, `admin`).
+`rynDNS` is a simple REST-API for `name` to `ip` resolving in the spirit of Dynamic DNS. Clients can `PUT` their `ipv4` address up to be read by other clients. Access is controlled via `api_key` and permissions (`read`, `write`, `admin`). No special client side application needed, just something to do a `POST` request like `wget`, `curl` or `httpie`. 
 
 <p align="center">
     <strong>
@@ -12,6 +12,7 @@
         • <a href="#getting-started">Getting started</a> 
         • <a href="#rest-api">Rest API</a> 
         • <a href="#configuration">Configuration</a>
+        • <a href="#roadmap">Roadmap</a>
 	</strong>
 </p>
 
@@ -43,38 +44,75 @@ JSON_REQUEST_BODY='{
   "public_ip": false
 }'
 http post $API_SERVER/admin/client $API_KEY <<< $JSON_REQUEST_BODY
+
+# Alternatively using query strings (be sure to encode special characters in the param values)
+API_KEY='X-API-Key=MdSUxrQQ.d5d40cd9.e2s1BsQEqmSE5MqyHYbDBVxGr/KY4BYIV5QkdjiCOF0='
+CLIENT_PARAMS='name=clientA&description=Client+across+the+river&permission=rw&public_ip=false'
+http post $API_SERVER/admin/client?$API_KEY&$CLIENT_PARAMS
+```
+Updating a write client's `ipv4`:
+```bash
+# using httpie
+API_SERVER=http://localhost:3000/rynDNS
+API_KEY=X-API-Key:zW3If4s5.3d6129cc.48d41d2a28b16a9a274d3f407026aee2b82cddbb3c11a5496ffe329c78e5d54b
+
+# automatically set ip based on request itself
+http put $API_SERVER/client $API_KEY
+
+# set a custom ip for the client
+JSON_REQUEST_BODY='{
+  "ipv4": "115.16.0.99"
+}'
+http put $API_SERVER/client $API_KEY <<< $JSON_REQUEST_BODY
+```
+Reading a write client's `ipv4` with a read client:
+```bash
+# using httpie
+API_SERVER=http://localhost:3000/rynDNS
+API_KEY=X-API-Key:zW3If4s5.28aef5cb.d502cb94ba0802c6363f95ecb3a70de7e2e4b889779e435b7c033f2c72ed4f20
+CLIENT_NAME=write_client
+
+http get $API_SERVER/clients/$CLIENT_NAME $ API_KEY
+
+# returns clients name and ipv4  as json
+#{
+#  "name": "write_client",
+#  "ipv4": "115.16.0.99"
+#}
 ```
 ## REST API
 A detailed and interactive specification can be found in the [demo](https://demo.api.pdev.dev) which is a render of the OpenAPI specification [api.yml](api.yml) with `swager-ui`.
 
 All requests except for `/public/*` require a valid `X-API-Key` header with appropriate permission.
 
+**Experimental:** All parameters (including `X-API-Key`) can be passed as query string.
+
 The following is a quick overview of the available commands.
 
 ### Admin
 Permission `x`
 
 * [`POST /admin/client`](https://demo.api.pdev.dev/#/admin/create_client) - Create or update a client and retrieve a new API key
-* [`​PUT /admin​/client`](https://demo.api.pdev.dev/#/admin/update_client) - Update an existing client
+* [`PUT /admin/client`](https://demo.api.pdev.dev/#/admin/update_client) - Update an existing client
-* [`​GET ​/admin​/clients`](https://demo.api.pdev.dev/#/admin/get_all_client) - Retrieve all clients information
+* [`GET /admin/clients`](https://demo.api.pdev.dev/#/admin/get_all_client) - Retrieve all clients information
-* [`​GET ​/admin​/clients​/{client_name}`](https://demo.api.pdev.dev/#/admin/get_client) - Retrieve client information
+* [`GET /admin/clients/{client_name}`](https://demo.api.pdev.dev/#/admin/get_client) - Retrieve client information
-* [`DELETE ​/admin​/clients​/{client_name}`](https://demo.api.pdev.dev/#/admin/delete_client) - Delete an existing client
+* [`DELETE /admin/clients/{client_name}`](https://demo.api.pdev.dev/#/admin/delete_client) - Delete an existing client
 
 ### Client (write)
 Permission `w`
 
-* [`​PUT /client`](https://demo.api.pdev.dev/#/client%20(write)/update_client_ip) - Update ipv4 client information based on request IP or body if present
+* [`PUT /client`](https://demo.api.pdev.dev/#/client%20(write)/update_client_ip) - Update ipv4 client information based on request IP or body if present
 * [`DELETE /client`](https://demo.api.pdev.dev/#/client%20(write)/delete_client_ip) - Delete the requesting client's ipv4 information
 
 ### Client (read)
 Permission `r`
 
-* [`​GET ​/clients​/{client_name}`](https://demo.api.pdev.dev/#/client%20(read)/get_client_ip) - Get ipv4 client information
+* [`GET /clients/{client_name}`](https://demo.api.pdev.dev/#/client%20(read)/get_client_ip) - Get ipv4 client information
 
 ### Public
 Client attribute `public_ip: true`
 
-* [`GET ​/public/{client_name}`](https://demo.api.pdev.dev/#/public/get_public_client_ip) - Get ipv4 client information
+* [`GET /public/{client_name}`](https://demo.api.pdev.dev/#/public/get_public_client_ip) - Get ipv4 client information
 
 ## Configuration
 
@@ -96,3 +134,11 @@ RAILS_API_DEMO: 1
 # [DOCKER only] set cycle to reset demo data [default: 60m]
 RAILS_DEMO_RESET: 60m
 ```
+
+## Roadmap
+
+* `Public Mode` - to allow for quick deployment without having to create clients/api-keys in a trusted environment (see #1)
+* ~~Support Query Strings - as alternative to api key in header and json body~~ (merged 297016e799)
+  * add full test coverage for query strings (considered experimental until then)
+  * add query strings to `api.yml` and additional examples
+* DNS Server in Docker container - resolve `client_name`s via DNS server

app/controllers/clients_controller.rb

@@ -178,10 +178,12 @@ class ClientsController < ApplicationController
   # check if the api is valid and has the appropriate prefix
   def parse_api_key_header
     # TODO: move api_key checks and formatting to helper class
-    # check if api key is present and can be split into 3 parts: <prefix>.<name_id>.<api_key>
+    # check if api key is present in header or param and can be split into 3 parts: <prefix>.<name_id>.<api_key>
     # NOTE: .compact is more for got measure than really necessary, but this ensures no nil values in the array
     api_key_header = request.headers[RynDNS::Application::API_KEY_HEADER].split('.').compact unless
       request.headers[RynDNS::Application::API_KEY_HEADER].nil?
+    api_key_header ||= params[RynDNS::Application::API_KEY_HEADER].split('.').compact if
+      params.has_key?(RynDNS::Application::API_KEY_HEADER)
     return head(401) if api_key_header.nil? || api_key_header.length < 3
 
     prefix, @name_id, @api_key = api_key_header

spec/requests/clients_request_spec.rb

@@ -12,7 +12,7 @@ RSpec.describe 'Clients', type: :request do
   let(:valid_client) do
     {
       name: 'clientA',
-      description: 'Client across the river',
+      description: 'Client&across the=river', # added &= for query string test
       permission: 'rw',
       public_ip: false
     }
@@ -78,31 +78,18 @@ RSpec.describe 'Clients', type: :request do
     context 'when sending a valid request' do
       before { post '/admin/client', params: valid_client, headers: api_key_header(admin_client) }
 
-      it 'creates client that can read/write and returns 201' do
+      it_behaves_like 'POST /admin/client 201'
-        expect(json_response).not_to be_empty
+    end
-        expect(json_response['name']).to eq valid_client[:name]
+
-        expect(json_response['api_key'].length).to eq 82
+    # TODO: add query string tests for all requests and use shared examples
-        expect(response).to have_http_status(201)
+    context 'when sending a valid request as query string' do
-        api_key = json_response['api_key']
+      before do
-        # check if request was parsed properly
+        api_key = "#{RynDNS::Application::API_KEY_HEADER}=#{api_key_header(admin_client)[RynDNS::Application::API_KEY_HEADER]}"
-        get "/admin/clients/#{valid_client[:name]}", headers: api_key_header(admin_client)
+        body = hash_to_query_string(valid_client)
-        expect(json_response).not_to be_empty
+        post "/admin/client?#{api_key}&#{body}"
-        expect(json_response['name']).to eq valid_client[:name]
-        expect(json_response['description']).to eq valid_client[:description]
-        expect(json_response['permission']).to eq valid_client[:permission]
-        expect(json_response['public_ip']).to eq valid_client[:public_ip]
-        expect(response).to have_http_status(200)
-        # test the new client write
-        put '/client', headers: api_key_header(nil, api_key)
-        expect(json_response).not_to be_empty
-        expect(response).to have_http_status(200)
-        ipv4 = json_response['ipv4']
-        # test the new client read
-        get "/clients/#{valid_client[:name]}", headers: api_key_header(nil, api_key)
-        expect(json_response).not_to be_empty
-        expect(response).to have_http_status(200)
-        expect(json_response['ipv4']).to eq ipv4
       end
+
+      it_behaves_like 'POST /admin/client 201'
     end
 
     context 'when sending a valid request without api_key' do

spec/support/request_spec_helper.rb

@@ -15,6 +15,15 @@ module RequestSpecHelper
     "#{'r' if perm_r}#{'w' if perm_w}#{'x' if perm_x}"
   end
 
+  def hash_to_query_string(hash)
+    result = ''
+    hash.each do |k, v|
+      # escape value to be uri save
+      result += "#{k}=#{CGI.escape(v.to_s)}&"
+    end
+    result.delete_suffix('&')
+  end
+
   def list_equals_db?(client_list)
     return false unless Client.count == client_list.count
 

spec/support/request_spec_shared.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'POST /admin/client 201' do
+  it 'creates client that can read/write and returns 201' do
+    expect(json_response).not_to be_empty
+    expect(json_response['name']).to eq valid_client[:name]
+    expect(json_response['api_key'].length).to eq 82
+    expect(response).to have_http_status(201)
+    api_key = json_response['api_key']
+    # check if request was parsed properly
+    get "/admin/clients/#{valid_client[:name]}", headers: api_key_header(admin_client)
+    expect(json_response).not_to be_empty
+    expect(json_response['name']).to eq valid_client[:name]
+    expect(json_response['description']).to eq valid_client[:description]
+    expect(json_response['permission']).to eq valid_client[:permission]
+    expect(json_response['public_ip']).to eq valid_client[:public_ip]
+    expect(response).to have_http_status(200)
+    # test the new client write
+    put '/client', headers: api_key_header(nil, api_key)
+    expect(json_response).not_to be_empty
+    expect(response).to have_http_status(200)
+    ipv4 = json_response['ipv4']
+    # test the new client read
+    get "/clients/#{valid_client[:name]}", headers: api_key_header(nil, api_key)
+    expect(json_response).not_to be_empty
+    expect(response).to have_http_status(200)
+    expect(json_response['ipv4']).to eq ipv4
+  end
+end