update to support V2 of Slack OAUTH 2.0 and aws-sdk-go-v2 (#16)

These are updates to support Slack's new OAUTH model as well as to migrate to aws-sdk-go-v2.

- We no longer need to use or store user or bot tokens
- Updated to use aws-sdk-go-v2 calls for dynamodb
- Migrated to use more builtins from slack-go/slack
- Cleaned up some error handling and logging
- Changed Docker build to support shelling into container and added in example for pre-run script support

Dockerfile

@@ -1,9 +1,9 @@
 FROM alpine:latest as alpine
 
-RUN apk add -U --no-cache ca-certificates
+RUN apk add -U --no-cache bash ca-certificates jq
 
-FROM scratch
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 ADD main /
-CMD ["/main"]
+COPY build/run.sh /
+
+CMD ["/run.sh"]
 EXPOSE 8080

README.md

@@ -16,13 +16,10 @@ on your local machine for development purposes.
 #### Go
 A working setup for the Go Programming Language is needed. Here is a [getting
 started](https://golang.org/doc/install) guide. The project is currently
-using go version 1.15 along with module support.
+using go version 1.16 along with module support.
 
 #### Slack
 
-NOTE: This project uses the original outdated Slack OAUTH 2.0 flow. Work is in
-progress to update this to use Slack's V2 OAUTH 2.0 flow.
-
 A slack account needs to be created as well as an
 [app](https://api.slack.com/apps). The app created is intended for
 development purposes. The following functionality must be enabled in the `Add
@@ -34,9 +31,13 @@ features and functionality` section of the slack app configuration:
   * set up '/jitsi' with: https://[server]/slash/jitsi
 * OAuth & Permissions
   * redirect URL: https://[server]/slack/auth
+  * Scopes: chat:write, commands, im:write, users:read
 * Event Subscriptions:
   * request URL: https://[server]/slack/event
-  * Subscribe to workspace events: 'tokens_revoked'
+  * Subscribe to workspace events: 'app_uninstalled'
+
+Note: This uses Slack v2 OAUTH 2.0. For legacy support, see:
+[v0.1.2](https://github.com/jitsi/jitsi-slack/releases/tag/v0.1.2)
 
 ## Configuration
 
@@ -56,14 +57,19 @@ JITSI_TOKEN_AUD=<audience for conference asap jwts>
 JITSI_CONFERENCE_HOST=<conference hosting service i.e. https://meet.jit.si>
 ```
 
+Note that `JITSI_TOKEN_SIGNING_KEY` is a dataurl that contains a
+base64-encoded PKCS1 or PKCS8 key, and should look something like:
+
+```data:application/pkcs1;kid=[urlencoded kid];base64,[base64 pkcs1 key]```
+
 ## Running
 
 Clone this project and build with `go build cmd/api/main.go` or build and run
 with `go run cmd/api/main.go`
 
 ## Dependency Management
 
-Dependency management for this project uses go module as of go version 1.15.
+Dependency management for this project uses go module as of go version 1.16.
 More information can be found at [go command
 documentation](https://golang.org/cmd/go/#hdr-Modules__module_versions__and_more).
 

build/run.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+# pre-run.sh is intended to include environment specific
+# setup such as env var injection of secrets.
+if [ -f /usr/jitsi/pre-run.sh ]; then
+    . /usr/jitsi/pre-run.sh
+fi
+
+exec /main

build_docker_image.sh

@@ -5,7 +5,7 @@ set -o nounset
 set -o pipefail
 
 main() {
-    rm ./main
+    rm -f ./main
     CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o main ./cmd/api/
     docker build -t jitsi/slack-integration:$TAG .
 }

cmd/api/main.go

@@ -8,9 +8,8 @@ import (
 	"os/signal"
 	"time"
 
-	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/session"
-	"github.com/aws/aws-sdk-go/service/dynamodb"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
 	"github.com/caarlos0/env"
 	jitsi "github.com/jitsi/jitsi-slack"
 	"github.com/justinas/alice"
@@ -53,15 +52,12 @@ func main() {
 		log.Fatal().Err(err).Msg("service is misconfigured")
 	}
 
-	// Setup dynamodb session and create a token store.
-	cfg := aws.Config{
-		Region: aws.String(app.DynamoRegion),
-	}
-	sess, err := session.NewSession(&cfg)
+	// set up acces to dynamodb stores
+	cfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion(app.DynamoRegion))
 	if err != nil {
 		log.Fatal().Err(err).Msg("cannot start service w/o aws session")
 	}
-	svc := dynamodb.New(sess)
+	svc := dynamodb.NewFromConfig(cfg)
 	tokenStore := jitsi.TokenStore{
 		TableName: app.TokenTable,
 		DB:        svc,
@@ -106,13 +102,11 @@ func main() {
 		TokenWriter:        &tokenStore,
 	}
 
-	accessURL := "https://slack.com/api/oauth.access?client_id=%s&client_secret=%s&code=%s"
 	oauthHandler := jitsi.SlackOAuthHandlers{
-		AccessURLTemplate: accessURL,
-		ClientID:          app.SlackClientID,
-		ClientSecret:      app.SlackClientSecret,
-		AppID:             app.SlackAppID,
-		TokenWriter:       &tokenStore,
+		ClientID:     app.SlackClientID,
+		ClientSecret: app.SlackClientSecret,
+		AppID:        app.SlackAppID,
+		TokenWriter:  &tokenStore,
 	}
 
 	// Create an http mux and a server for that mux.

go.mod

@@ -1,26 +1,21 @@
 module github.com/jitsi/jitsi-slack
 
-go 1.15
+go 1.16
 
 require (
-	github.com/aws/aws-sdk-go v1.15.6
+	github.com/aws/aws-sdk-go-v2 v1.2.0
+	github.com/aws/aws-sdk-go-v2/config v1.1.1
+	github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.0.2
+	github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression v1.0.2
+	github.com/aws/aws-sdk-go-v2/service/dynamodb v1.1.1
 	github.com/caarlos0/env v3.3.0+incompatible
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/go-ini/ini v1.38.1 // indirect
-	github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e // indirect
-	github.com/jtolds/gls v4.2.1+incompatible // indirect
 	github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da
-	github.com/mitchellh/mapstructure v1.1.2
 	github.com/rs/xid v1.2.0 // indirect
 	github.com/rs/zerolog v1.8.0
 	github.com/slack-go/slack v0.8.0
-	github.com/smartystreets/assertions v0.0.0-20190116191733-b6c0e53d7304 // indirect
-	github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c // indirect
 	github.com/stretchr/testify v1.3.0 // indirect
-	github.com/vincent-petithory/dataurl v0.0.0-20160330182126-9a301d65acbb
+	github.com/vincent-petithory/dataurl v0.0.0-20191104211930-d1553a71de50
 	github.com/zenazn/goji v0.0.0-20160507202103-64eb34159fe5 // indirect
-	golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3 // indirect
-	golang.org/x/sys v0.0.0-20180808154034-904bdc257025 // indirect
-	golang.org/x/text v0.3.0 // indirect
-	gopkg.in/ini.v1 v1.41.0 // indirect
+	golang.org/x/sys v0.0.0-20210226181700-f36f78243c0c // indirect
 )

go.sum

@@ -1,5 +1,29 @@
-github.com/aws/aws-sdk-go v1.15.6 h1:JRgUEp143FVHH3LOV2ggH2f6h+Tl1EgGphqaoH/Xibk=
-github.com/aws/aws-sdk-go v1.15.6/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZoCYDt7FT0=
+github.com/aws/aws-sdk-go-v2 v1.2.0 h1:BS+UYpbsElC82gB+2E2jiCBg36i8HlubTB/dO/moQ9c=
+github.com/aws/aws-sdk-go-v2 v1.2.0/go.mod h1:zEQs02YRBw1DjK0PoJv3ygDYOFTre1ejlJWl8FwAuQo=
+github.com/aws/aws-sdk-go-v2/config v1.1.1 h1:ZAoq32boMzcaTW9bcUacBswAmHTbvlvDJICgHFZuECo=
+github.com/aws/aws-sdk-go-v2/config v1.1.1/go.mod h1:0XsVy9lBI/BCXm+2Tuvt39YmdHwS5unDQmxZOYe8F5Y=
+github.com/aws/aws-sdk-go-v2/credentials v1.1.1 h1:NbvWIM1Mx6sNPTxowHgS2ewXCRp+NGTzUYb/96FZJbY=
+github.com/aws/aws-sdk-go-v2/credentials v1.1.1/go.mod h1:mM2iIjwl7LULWtS6JCACyInboHirisUUdkBPoTHMOUo=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.0.2 h1:Lii+DAkH/gdqUQ0KqFUO6LdEkvjC73dJjc9SLJWTI+8=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.0.2/go.mod h1:L5YMsCINxFbyXwRIbAzg+hNJFsDYhMaspDVcTHl9aDI=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression v1.0.2 h1:BkuxGEB4Ge//i2pW/eteiw3YFw1aQWKOULZgMe4DBtc=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression v1.0.2/go.mod h1:EaHGqA2Mt6VRkXmjYTw7Q8v6Tc0CIGukjjAMJeSoK4g=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.0.2 h1:EtEU7WRaWliitZh2nmuxEXrN0Cb8EgPUFGIoTMeqbzI=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.0.2/go.mod h1:3hGg3PpiEjHnrkrlasTfxFqUsZ2GCk/fMUn4CbKgSkM=
+github.com/aws/aws-sdk-go-v2/service/dynamodb v1.1.1 h1:rs3qt8vsrOXgm3qfVdjVkwnPiBXI2M7qN1nExoZmJfI=
+github.com/aws/aws-sdk-go-v2/service/dynamodb v1.1.1/go.mod h1:0xGVqnX5hK8bd/Qnqklpdellx5/6KPSPV7vfno3i1Sk=
+github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.1.1 h1:sG4o2ak7oynkN11KkdwIrl4VAzef+kRoZotJJh0dBmM=
+github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.1.1/go.mod h1:UYAPPHDBldbFpS0RXPsPbUbnLr1HqJ1rvzr0NL3ggSQ=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.0.1 h1:q+3dVb1s3piv/Q/Ft0+OjU5iKItBRfCvU5wNLQUyIbA=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.0.1/go.mod h1:zurGx7QI3Bk2OFwswSXl3PtJDdgD3QzjkfskiukJ2Mg=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.0.2 h1:4AH9fFjUlVktQMznF+YN33aWNXaR4VgDXyP28qokJC0=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.0.2/go.mod h1:45MfaXZ0cNbeuT0KQ1XJylq8A6+OpVV2E5kvY/Kq+u8=
+github.com/aws/aws-sdk-go-v2/service/sso v1.1.1 h1:37QubsarExl5ZuCBlnRP+7l1tNwZPBSTqpTBrPH98RU=
+github.com/aws/aws-sdk-go-v2/service/sso v1.1.1/go.mod h1:SuZJxklHxLAXgLTc1iFXbEWkXs7QRTQpCLGaKIprQW0=
+github.com/aws/aws-sdk-go-v2/service/sts v1.1.1 h1:TJoIfnIFubCX0ACVeJ0w46HEH5MwjwYN4iFhuYIhfIY=
+github.com/aws/aws-sdk-go-v2/service/sts v1.1.1/go.mod h1:Wi0EBZwiz/K44YliU0EKxqTCJGUfYTWXrrBwkq736bM=
+github.com/aws/smithy-go v1.1.0 h1:D6CSsM3gdxaGaqXnPgOBCeL6Mophqzu7KJOu7zW78sU=
+github.com/aws/smithy-go v1.1.0/go.mod h1:EzMw8dbp/YJL4A5/sbhGddag+NPT7q084agLbB9LgIw=
 github.com/caarlos0/env v3.3.0+incompatible h1:jCfY0ilpzC2FFViyZyDKCxKybDESTwaR+ebh8zm6AOE=
 github.com/caarlos0/env v3.3.0+incompatible/go.mod h1:tdCsowwCzMLdkqRYDlHpZCp2UooDD3MspDBjZ2AD02Y=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
@@ -8,23 +32,19 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 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/go-ini/ini v1.25.4/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
-github.com/go-ini/ini v1.38.1 h1:hbtfM8emWUVo9GnXSloXYyFbXxZ+tG6sbepSStoe1FY=
-github.com/go-ini/ini v1.38.1/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/go-test/deep v1.0.4 h1:u2CU3YKy9I2pmu9pX0eq50wCgjfGIt539SqR7FbHiho=
 github.com/go-test/deep v1.0.4/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
-github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e h1:JKmoR8x90Iww1ks85zJ1lfDGgIiMDuIptTOhJq+zKyg=
-github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8 h1:12VvqtR6Aowv3l/EQUlocDHW2Cp4G9WJVH7uyH8QFJE=
-github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
-github.com/jtolds/gls v4.2.1+incompatible h1:fSuqC+Gmlu6l/ZYAoZzx2pyucC8Xza35fpRVWLVmUEE=
-github.com/jtolds/gls v4.2.1+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
+github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
 github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da h1:5y58+OCjoHCYB8182mpf/dEsq0vwTKPOo4zGfH0xW9A=
 github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da/go.mod h1:oLH0CmIaxCGXD67VKGR5AacGXZSMznlmeqM8RzPrcY8=
-github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
-github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -35,23 +55,19 @@ github.com/rs/zerolog v1.8.0 h1:Oglcb4i6h42uWacEjomB2MI8gfkwCwTMFaDY3+Vgj5k=
 github.com/rs/zerolog v1.8.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OKkWU=
 github.com/slack-go/slack v0.8.0 h1:ANyLY5KHLV+MxLJDQum2IuHTLwbCbDtaWY405X1EU9U=
 github.com/slack-go/slack v0.8.0/go.mod h1:FGqNzJBmxIsZURAxh2a8D21AnOVvvXZvGligs4npPUM=
-github.com/smartystreets/assertions v0.0.0-20190116191733-b6c0e53d7304 h1:Jpy1PXuP99tXNrhbq2BaPz9B+jNAvH1JPQQpG/9GCXY=
-github.com/smartystreets/assertions v0.0.0-20190116191733-b6c0e53d7304/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
-github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c h1:Ho+uVpkel/udgjbwB5Lktg9BtvJSh2DT0Hi6LPSyI2w=
-github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c/go.mod h1:XDJAKZRPZ1CvBcN2aX5YOUTYGHki24fSF0Iv48Ibg0s=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/vincent-petithory/dataurl v0.0.0-20160330182126-9a301d65acbb h1:lyL3z7vYwTWXf4/bI+A01+cCSnfhKIBhy+SQ46Z/ml8=
-github.com/vincent-petithory/dataurl v0.0.0-20160330182126-9a301d65acbb/go.mod h1:FHafX5vmDzyP+1CQATJn7WFKc9CvnvxyvZy6I1MrG/U=
+github.com/vincent-petithory/dataurl v0.0.0-20191104211930-d1553a71de50 h1:uxE3GYdXIOfhMv3unJKETJEhw78gvzuQqRX/rVirc2A=
+github.com/vincent-petithory/dataurl v0.0.0-20191104211930-d1553a71de50/go.mod h1:FHafX5vmDzyP+1CQATJn7WFKc9CvnvxyvZy6I1MrG/U=
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-golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3 h1:ulvT7fqt0yHWzpJwI57MezWnYDVpCAYBVuYst/L+fAY=
-golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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