Document extractor service (#15665)

* Document extractor service

* Fixing vendor modules

* Addressing PR Review comments

* Some small simplifications

* Fixing a linter complain

* simplifying a bit the code using package variables

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

go.mod

@@ -3,11 +3,13 @@ module github.com/mattermost/mattermost-server/v5
 go 1.14
 
 require (
+	code.sajari.com/docconv v1.1.1-0.20200701232649-d9ea05fbd50a
 	github.com/HdrHistogram/hdrhistogram-go v0.9.0 // indirect
 	github.com/Masterminds/semver/v3 v3.1.0
 	github.com/Masterminds/squirrel v1.4.0
 	github.com/NYTimes/gziphandler v1.1.1
 	github.com/RoaringBitmap/roaring v0.5.1 // indirect
+	github.com/advancedlogic/GoOse v0.0.0-20200830213114-1225d531e0ad // indirect
 	github.com/armon/go-metrics v0.3.4 // indirect
 	github.com/avct/uasurfer v0.0.0-20191028135549-26b5daa857f1
 	github.com/aws/aws-sdk-go v1.35.5
@@ -59,6 +61,7 @@ require (
 	github.com/jmoiron/sqlx v1.2.0
 	github.com/jonboulle/clockwork v0.2.2
 	github.com/klauspost/compress v1.11.1 // indirect
+	github.com/ledongthuc/pdf v0.0.0-20200323191019-23c5852adbd2
 	github.com/lib/pq v1.8.0
 	github.com/magiconair/properties v1.8.4 // indirect
 	github.com/mailru/easyjson v0.7.6 // indirect
@@ -70,15 +73,14 @@ require (
 	github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0
 	github.com/mattermost/viper v1.0.4
 	github.com/mattn/go-colorable v0.1.8 // indirect
-	github.com/mattn/go-runewidth v0.0.9 // indirect
 	github.com/mattn/go-sqlite3 v2.0.3+incompatible
+	github.com/mholt/archiver/v3 v3.4.0
 	github.com/miekg/dns v1.1.31 // indirect
 	github.com/minio/minio-go/v7 v7.0.5
 	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
 	github.com/mitchellh/mapstructure v1.3.3 // indirect
 	github.com/muesli/smartcrop v0.3.0 // indirect
 	github.com/oklog/run v1.1.0 // indirect
-	github.com/olekukonko/tablewriter v0.0.4 // indirect
 	github.com/olivere/elastic v6.2.35+incompatible // indirect
 	github.com/oov/psd v0.0.0-20201002182931-74231384897f
 	github.com/opentracing/opentracing-go v1.2.0
@@ -103,7 +105,6 @@ require (
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
 	github.com/stretchr/objx v0.3.0 // indirect
 	github.com/stretchr/testify v1.6.1
 	github.com/tecbot/gorocksdb v0.0.0-20191217155057-f0fad39f321c // indirect