diff --git a/go.mod b/go.mod
index 2170dc9bc7fe102b498580ad943759a92f913a11..21bd59f1fce86468a37a93cb7caf5eaebb8ed892 100644
--- a/go.mod
+++ b/go.mod
@@ -13,10 +13,13 @@ require (
github.com/go-redis/redis/v7 v7.2.0
github.com/kr/pretty v0.2.0 // indirect
github.com/mbland/hmacauth v0.0.0-20170912233209-44256dfd4bfa
+ github.com/mitchellh/mapstructure v1.1.2
github.com/mreiferson/go-options v1.0.0
github.com/onsi/ginkgo v1.12.0
github.com/onsi/gomega v1.9.0
github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
+ github.com/spf13/pflag v1.0.3
+ github.com/spf13/viper v1.6.3
github.com/stretchr/testify v1.5.1
github.com/yhat/wsutil v0.0.0-20170731153501-1d66fa95c997
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
diff --git a/go.sum b/go.sum
index 5d4662da5d7ab1ed8678d93d33be9f0062f016af..5e85e765aa89dc10c8b3bd710438dc64173ca0c2 100644
--- a/go.sum
+++ b/go.sum
@@ -4,67 +4,117 @@ cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alicebob/gopher-json v0.0.0-20180125190556-5a6b3ba71ee6 h1:45bxf7AZMwWcqkLzDAQugVEwedisr5nRJ1r+7LYnv0U=
github.com/alicebob/gopher-json v0.0.0-20180125190556-5a6b3ba71ee6/go.mod h1:SGnFV6hVsYE877CKEZ6tDNTjaSXYUk6QqoIK6PrAtcc=
github.com/alicebob/miniredis/v2 v2.11.2 h1:OtWO7akm5otuhssnE/sNfsWxG4gZ8DbGhShDtRrByJs=
github.com/alicebob/miniredis/v2 v2.11.2/go.mod h1:VL3UDEfAH59bSa7MuHMuFToxkqyHh69s/WUbYlOAuyg=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
github.com/bitly/go-simplejson v0.5.0 h1:6IH+V8/tVMab511d5bn4M7EwGXZf9Hj6i2xSwkNEM+Y=
github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA=
github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4YnC6+E63dPcxHo2sUxDIu8g3QgEJdRY=
github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
github.com/coreos/go-oidc v2.2.1+incompatible h1:mh48q/BqXqgjVHpy2ZY7WnWAbenxRjsz9N1i1YxjHAk=
github.com/coreos/go-oidc v2.2.1+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
github.com/go-redis/redis/v7 v7.2.0 h1:CrCexy/jYWZjW0AyVoHlcJUeZN19VWlbepTh1Vq6dJs=
github.com/go-redis/redis/v7 v7.2.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
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github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
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github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/gomodule/redigo v1.7.1-0.20190322064113-39e2c31b7ca3 h1:6amM4HsNPOvMLVc2ZnyqrjeQ92YAVWn7T4WBKK87inY=
github.com/gomodule/redigo v1.7.1-0.20190322064113-39e2c31b7ca3/go.mod h1:B4C85qUVwatsJoIUNIfCRsp7qO0iAmpGFZ4EELWSbC4=
github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
+github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
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github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
github.com/googleapis/gax-go/v2 v2.0.5 h1:sjZBwGj9Jlw33ImPtvFviGYvseOtDM7hkSKB7+Tv3SM=
github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
+github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
+github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
+github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
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github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
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github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
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+github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.2.0 h1:s5hAObm+yFO5uHYt5dYjxi2rXrsnmRpJx4OYvIWUaQs=
github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
+github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
github.com/mbland/hmacauth v0.0.0-20170912233209-44256dfd4bfa h1:hI1uC2A3vJFjwvBn0G0a7QBRdBUp6Y048BtLAHRTKPo=
github.com/mbland/hmacauth v0.0.0-20170912233209-44256dfd4bfa/go.mod h1:8vxFeeg++MqgCHwehSuwTlYCF0ALyDJbYJ1JsKi7v6s=
+github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
+github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/mreiferson/go-options v1.0.0 h1:RMLidydGlDWpL+lQTXo0bVIf/XT2CTq7AEJMoz5/VWs=
github.com/mreiferson/go-options v1.0.0/go.mod h1:zHtCks/HQvOt8ATyfwVe3JJq2PPuImzXINPRTC03+9w=
+github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/ginkgo v1.10.1/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/ginkgo v1.12.0 h1:Iw5WCbBcaAAd0fpRb1c9r5YCylv4XDoCSigm1zLevwU=
@@ -73,20 +123,61 @@ github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1Cpa
github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
github.com/onsi/gomega v1.9.0 h1:R1uwffexN6Pr340GtYRIdZmAiN4J+iw6WG4wog1DUXg=
github.com/onsi/gomega v1.9.0/go.mod h1:Ho0h+IUsWyvy1OpqCwxlQ/21gkhVunqlU8fDGcoTdcA=
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go.opencensus.io v0.21.0 h1:mU6zScU4U1YAFPHEHYk+3JC4SY7JxgkqS10ZOSyksNg=
go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -98,11 +189,14 @@ golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHl
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c h1:uOCk1iQW6Vc18bnC13MfzScl+wdKBmM9Y9kU7Z83/lw=
golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g=
golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -117,7 +211,10 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20190204203706-41f3e6584952/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b h1:ag/x1USPSsqHud38I9BAC88qdNLDHHtQ4mlgQIZPPNA=
@@ -131,11 +228,14 @@ golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3
golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
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@@ -152,21 +252,28 @@ google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRn
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
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google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
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gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
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gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/pkg/apis/options/load.go b/pkg/apis/options/load.go
new file mode 100644
index 0000000000000000000000000000000000000000..72294c28009057718302710b8a56ad36b8727818
--- /dev/null
+++ b/pkg/apis/options/load.go
@@ -0,0 +1,132 @@
+package options
+
+import (
+ "fmt"
+ "reflect"
+ "strings"
+
+ "github.com/mitchellh/mapstructure"
+ "github.com/spf13/pflag"
+ "github.com/spf13/viper"
+)
+
+// Load reads in the config file at the path given, then merges in environment
+// variables (prefixed with `OAUTH2_PROXY`) and finally merges in flags from the flagSet.
+// If a config value is unset and the flag has a non-zero value default, this default will be used.
+// Eg. A field defined:
+// FooBar `cfg:"foo_bar" flag:"foo-bar"`
+// Can be set in the config file as `foo_bar="baz"`, in the environment as `OAUTH2_PROXY_FOO_BAR=baz`,
+// or via the command line flag `--foo-bar=baz`.
+func Load(configFileName string, flagSet *pflag.FlagSet, into interface{}) error {
+ v := viper.New()
+ v.SetConfigFile(configFileName)
+ v.SetConfigType("toml") // Config is in toml format
+ v.SetEnvPrefix("OAUTH2_PROXY")
+ v.AutomaticEnv()
+ v.SetTypeByDefaultValue(true)
+
+ if configFileName != "" {
+ err := v.ReadInConfig()
+ if err != nil {
+ return fmt.Errorf("unable to load config file: %w", err)
+ }
+ }
+
+ err := registerFlags(v, "", flagSet, into)
+ if err != nil {
+ // This should only happen if there is a programming error
+ return fmt.Errorf("unable to register flags: %w", err)
+ }
+
+ err = v.Unmarshal(into, decodeFromCfgTag)
+ if err != nil {
+ return fmt.Errorf("error unmarshalling config: %w", err)
+ }
+
+ return nil
+}
+
+// registerFlags uses `cfg` and `flag` tags to associate flags in the flagSet
+// to the fields in the options interface provided.
+// Each exported field in the options must have a `cfg` tag otherwise an error will occur.
+// - For fields, set `cfg` and `flag` so that `flag` is the name of the flag associated to this config option
+// - For exported fields that are not user facing, set the `cfg` to `,internal`
+// - For structs containing user facing fields, set the `cfg` to `,squash`
+func registerFlags(v *viper.Viper, prefix string, flagSet *pflag.FlagSet, options interface{}) error {
+ val := reflect.ValueOf(options)
+ var typ reflect.Type
+ if val.Kind() == reflect.Ptr {
+ typ = val.Elem().Type()
+ } else {
+ typ = val.Type()
+ }
+
+ for i := 0; i < typ.NumField(); i++ {
+ // pull out the struct tags:
+ // flag - the name of the command line flag
+ // cfg - the name of the config file option
+ field := typ.Field(i)
+ fieldV := reflect.Indirect(val).Field(i)
+ fieldName := strings.Join([]string{prefix, field.Name}, ".")
+
+ cfgName := field.Tag.Get("cfg")
+ if cfgName == ",internal" {
+ // Public but internal types that should not be exposed to users, skip them
+ continue
+ }
+
+ if isUnexported(field.Name) {
+ // Unexported fields cannot be set by a user, so won't have tags or flags, skip them
+ continue
+ }
+
+ if field.Type.Kind() == reflect.Struct {
+ if cfgName != ",squash" {
+ return fmt.Errorf("field %q does not have required cfg tag: `,squash`", fieldName)
+ }
+ err := registerFlags(v, fieldName, flagSet, fieldV.Interface())
+ if err != nil {
+ return err
+ }
+ continue
+ }
+
+ flagName := field.Tag.Get("flag")
+ if flagName == "" || cfgName == "" {
+ return fmt.Errorf("field %q does not have required tags (cfg, flag)", fieldName)
+ }
+
+ if flagSet == nil {
+ return fmt.Errorf("flagset cannot be nil")
+ }
+
+ f := flagSet.Lookup(flagName)
+ if f == nil {
+ return fmt.Errorf("field %q does not have a registered flag", flagName)
+ }
+ err := v.BindPFlag(cfgName, f)
+ if err != nil {
+ return fmt.Errorf("error binding flag for field %q: %w", fieldName, err)
+ }
+ }
+
+ return nil
+}
+
+// decodeFromCfgTag sets the Viper decoder to read the names from the `cfg` tag
+// on each struct entry.
+func decodeFromCfgTag(c *mapstructure.DecoderConfig) {
+ c.TagName = "cfg"
+}
+
+// isUnexported checks if a field name starts with a lowercase letter and therefore
+// if it is unexported.
+func isUnexported(name string) bool {
+ if len(name) == 0 {
+ // This should never happen
+ panic("field name has len 0")
+ }
+
+ first := string(name[0])
+ return first == strings.ToLower(first)
+}
diff --git a/pkg/apis/options/load_test.go b/pkg/apis/options/load_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..0d316fcddc1a01cdb14e27581eb39f1fd814c129
--- /dev/null
+++ b/pkg/apis/options/load_test.go
@@ -0,0 +1,288 @@
+package options
+
+import (
+ "fmt"
+ "io/ioutil"
+ "os"
+ "testing"
+
+ . "github.com/onsi/ginkgo"
+ . "github.com/onsi/ginkgo/extensions/table"
+ . "github.com/onsi/gomega"
+ "github.com/spf13/pflag"
+)
+
+func TestOptionsSuite(t *testing.T) {
+ RegisterFailHandler(Fail)
+ RunSpecs(t, "Options Suite")
+}
+
+var _ = Describe("Load", func() {
+ Context("with a testOptions structure", func() {
+ type TestOptionSubStruct struct {
+ StringSliceOption []string `flag:"string-slice-option" cfg:"string_slice_option"`
+ }
+
+ type TestOptions struct {
+ StringOption string `flag:"string-option" cfg:"string_option"`
+ Sub TestOptionSubStruct `cfg:",squash"`
+ // Check exported but internal fields do not break loading
+ Internal *string `cfg:",internal"`
+ // Check unexported fields do not break loading
+ unexported string
+ }
+
+ type MissingSquashTestOptions struct {
+ StringOption string `flag:"string-option" cfg:"string_option"`
+ Sub TestOptionSubStruct
+ }
+
+ type MissingCfgTestOptions struct {
+ StringOption string `flag:"string-option"`
+ Sub TestOptionSubStruct `cfg:",squash"`
+ }
+
+ type MissingFlagTestOptions struct {
+ StringOption string `cfg:"string_option"`
+ Sub TestOptionSubStruct `cfg:",squash"`
+ }
+
+ var testOptionsConfigBytes = []byte(`
+ string_option="foo"
+ string_slice_option="a,b,c,d"
+ `)
+
+ var testOptionsFlagSet *pflag.FlagSet
+
+ type testOptionsTableInput struct {
+ env map[string]string
+ args []string
+ configFile []byte
+ flagSet func() *pflag.FlagSet
+ expectedErr error
+ input interface{}
+ expectedOutput interface{}
+ }
+
+ BeforeEach(func() {
+ testOptionsFlagSet = pflag.NewFlagSet("testFlagSet", pflag.ExitOnError)
+ testOptionsFlagSet.String("string-option", "default", "")
+ testOptionsFlagSet.StringSlice("string-slice-option", []string{"a", "b"}, "")
+ })
+
+ DescribeTable("Load",
+ func(o *testOptionsTableInput) {
+ var configFileName string
+
+ if o.configFile != nil {
+ By("Creating a config file")
+ configFile, err := ioutil.TempFile("", "oauth2-proxy-test-legacy-config-file")
+ Expect(err).ToNot(HaveOccurred())
+ defer configFile.Close()
+
+ _, err = configFile.Write(o.configFile)
+ Expect(err).ToNot(HaveOccurred())
+ defer os.Remove(configFile.Name())
+
+ configFileName = configFile.Name()
+ }
+
+ if len(o.env) > 0 {
+ By("Setting environment variables")
+ for k, v := range o.env {
+ os.Setenv(k, v)
+ defer os.Unsetenv(k)
+ }
+ }
+
+ Expect(o.flagSet).ToNot(BeNil())
+ flagSet := o.flagSet()
+ Expect(flagSet).ToNot(BeNil())
+
+ if len(o.args) > 0 {
+ By("Parsing flag arguments")
+ Expect(flagSet.Parse(o.args)).To(Succeed())
+ }
+
+ var input interface{}
+ if o.input != nil {
+ input = o.input
+ } else {
+ input = &TestOptions{}
+ }
+ err := Load(configFileName, flagSet, input)
+ if o.expectedErr != nil {
+ Expect(err).To(MatchError(o.expectedErr.Error()))
+ } else {
+ Expect(err).ToNot(HaveOccurred())
+ }
+ Expect(input).To(Equal(o.expectedOutput))
+ },
+ Entry("with just a config file", &testOptionsTableInput{
+ configFile: testOptionsConfigBytes,
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "foo",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c", "d"},
+ },
+ },
+ }),
+ Entry("when setting env variables", &testOptionsTableInput{
+ configFile: testOptionsConfigBytes,
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "bar",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c"},
+ },
+ },
+ }),
+ Entry("when setting flags", &testOptionsTableInput{
+ configFile: testOptionsConfigBytes,
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ args: []string{
+ "--string-option", "baz",
+ "--string-slice-option", "a,b,c,d,e",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "baz",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c", "d", "e"},
+ },
+ },
+ }),
+ Entry("when setting flags multiple times", &testOptionsTableInput{
+ configFile: testOptionsConfigBytes,
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ args: []string{
+ "--string-option", "baz",
+ "--string-slice-option", "x",
+ "--string-slice-option", "y",
+ "--string-slice-option", "z",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "baz",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"x", "y", "z"},
+ },
+ },
+ }),
+ Entry("when setting env variables without a config file", &testOptionsTableInput{
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "bar",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c"},
+ },
+ },
+ }),
+ Entry("when setting flags without a config file", &testOptionsTableInput{
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ args: []string{
+ "--string-option", "baz",
+ "--string-slice-option", "a,b,c,d,e",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "baz",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c", "d", "e"},
+ },
+ },
+ }),
+ Entry("when setting flags without a config file", &testOptionsTableInput{
+ env: map[string]string{
+ "OAUTH2_PROXY_STRING_OPTION": "bar",
+ "OAUTH2_PROXY_STRING_SLICE_OPTION": "a,b,c",
+ },
+ args: []string{
+ "--string-option", "baz",
+ "--string-slice-option", "a,b,c,d,e",
+ },
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "baz",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b", "c", "d", "e"},
+ },
+ },
+ }),
+ Entry("when nothing is set it should use flag defaults", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedOutput: &TestOptions{
+ StringOption: "default",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b"},
+ },
+ },
+ }),
+ Entry("with an invalid config file", &testOptionsTableInput{
+ configFile: []byte(`slice_option = foo`),
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedErr: fmt.Errorf("unable to load config file: While parsing config: (1, 16): never reached"),
+ expectedOutput: &TestOptions{},
+ }),
+ Entry("with an invalid flagset", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet {
+ // Missing a flag
+ f := pflag.NewFlagSet("testFlagSet", pflag.ExitOnError)
+ f.String("string-option", "default", "")
+ return f
+ },
+ expectedErr: fmt.Errorf("unable to register flags: field \"string-slice-option\" does not have a registered flag"),
+ expectedOutput: &TestOptions{},
+ }),
+ Entry("with an struct is missing the squash tag", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedErr: fmt.Errorf("unable to register flags: field \".Sub\" does not have required cfg tag: `,squash`"),
+ input: &MissingSquashTestOptions{},
+ expectedOutput: &MissingSquashTestOptions{},
+ }),
+ Entry("with a field is missing the cfg tag", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedErr: fmt.Errorf("unable to register flags: field \".StringOption\" does not have required tags (cfg, flag)"),
+ input: &MissingCfgTestOptions{},
+ expectedOutput: &MissingCfgTestOptions{},
+ }),
+ Entry("with a field is missing the flag tag", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ expectedErr: fmt.Errorf("unable to register flags: field \".StringOption\" does not have required tags (cfg, flag)"),
+ input: &MissingFlagTestOptions{},
+ expectedOutput: &MissingFlagTestOptions{},
+ }),
+ Entry("with existing unexported fields", &testOptionsTableInput{
+ flagSet: func() *pflag.FlagSet { return testOptionsFlagSet },
+ input: &TestOptions{
+ unexported: "unexported",
+ },
+ expectedOutput: &TestOptions{
+ StringOption: "default",
+ Sub: TestOptionSubStruct{
+ StringSliceOption: []string{"a", "b"},
+ },
+ unexported: "unexported",
+ },
+ }),
+ )
+ })
+})