require 'sinatra'
require 'sinatra/contrib'

def get_variations( str )
    return if !str

    str = URI.decode( str )
    k, v = str.strip.split( ':' )
    custom = { k => v }
    headers( custom )
    ''
end

get '/' do
    <<-EOHTML
        <a href="/link?input=default">Link</a>
        <a href="/form">Form</a>
        <a href="/cookie">Cookie</a>
        <a href="/header">Header</a>
        <a href="/link-template">Link template</a>
    EOHTML
end

get '/link' do
    <<-EOHTML
        <a href="/link/straight?input=default">Link</a>
        <a href="/link/append?input=default">Link</a>
    EOHTML
end

get '/link/straight' do
    default = 'default'
    return if params['input'].start_with?( default )

    get_variations( params['input'].split( default ).last )
end

get '/link/append' do
    default = 'default'
    return if !params['input'].start_with?( default )

    get_variations( params['input'].split( default ).last )
end

get '/link-template' do
    <<-EOHTML
        <a href="/link-template/straight/input/default/stuff">Link</a>
        <a href="/link-template/append/input/default/stuff">Link</a>
    EOHTML
end

get '/link-template/straight/input/*/stuff' do
    val = params[:splat].first
    default = 'default'
    return if val.start_with?( default )

    get_variations( val.split( default ).last )
end

get '/link-template/append/input/*/stuff' do
    val = params[:splat].first
    default = 'default'
    return if !val.start_with?( default )

    get_variations( val.split( default ).last )
end

get '/form' do
    <<-EOHTML
        <form action="/form/straight">
            <input name='input' value='default' />
        </form>

        <form action="/form/append">
            <input name='input' value='default' />
        </form>
    EOHTML
end

get '/form/straight' do
    default = 'default'
    return if !params['input'] || params['input'].start_with?( default )

    get_variations( params['input'].split( default ).last )
end

get '/form/append' do
    default = 'default'
    return if !params['input'] || !params['input'].start_with?( default )

    get_variations( params['input'].split( default ).last )
end


get '/cookie' do
    <<-EOHTML
        <a href="/cookie/straight">Cookie</a>
        <a href="/cookie/append">Cookie</a>
    EOHTML
end

get '/cookie/straight' do
    default = 'cookie value'
    cookies['cookie'] ||= default

    return if cookies['cookie'].start_with?( default )

    get_variations( cookies['cookie'].split( default ).last )
end

get '/cookie/append' do
    default = 'cookie value'
    cookies['cookie2'] ||= default
    return if !cookies['cookie2'].start_with?( default )

    get_variations( cookies['cookie2'].split( default ).last )
end

get '/header' do
    <<-EOHTML
        <a href="/header/straight">Header</a>
        <a href="/header/append">Header</a>
    EOHTML
end

get '/header/straight' do
    default = 'arachni_user'
    return if !env['HTTP_USER_AGENT'] || env['HTTP_USER_AGENT'].start_with?( default )

    get_variations( env['HTTP_USER_AGENT'].split( default ).last )
end

get '/header/append' do
    default = 'arachni_user'
    return if !env['HTTP_USER_AGENT'] || !env['HTTP_USER_AGENT'].start_with?( default )

    get_variations( env['HTTP_USER_AGENT'].split( default ).last )
end