From 6ba551d6d52d1ac3c98b067e653c22768c920cd1 Mon Sep 17 00:00:00 2001
From: Nicolas Thauvin <nico@orgrim.net>
Date: Thu, 16 Dec 2021 17:07:23 +0100
Subject: [PATCH] upload files to GCS

---
 CHANGELOG.md   |   3 +
 README.md      |   8 +-
 config.go      |  25 ++-
 config_test.go |   2 +-
 go.mod         |   4 +-
 go.sum         | 467 +++++++++++++++++++++++++++++++++++++++++++++++++
 main.go        |  12 ++
 pg_back.conf   |   9 +-
 upload.go      |  94 ++++++++++
 9 files changed, 616 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44f448c..c675f23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@
 * Ensure jobs option is greater than or equal to 1
 * Upload files to AWS S3
 * Upload files to a remote host with SFTP
+* Upload files to Google Cloud Storage (GCS)
+
 
 ## pg_back 2.0.1
 
@@ -18,6 +20,7 @@
 * Allow postgresql URIs as connection strings
 * Tell pg_dump and pg_dumpall never to prompt for a password
 
+
 ## pg_back 2.0.0
 
 * Full rewrite in Go
diff --git a/README.md b/README.md
index 7c43aad..4ec79b0 100644
--- a/README.md
+++ b/README.md
@@ -164,8 +164,8 @@ All files produced by a run can be uploaded to a remote location by setting the
 `s3`, `sftp` or `none`.
 
 When set to `s3`, files are uploaded to AWS S3. The `--s3-*` family of options
-can be used to tweak the access to the bucket. The `--s3-profile` option only reads
-credentials and basic configuration, s3 specific options are not used.
+can be used to tweak the access to the bucket. The `--s3-profile` option only
+reads credentials and basic configuration, s3 specific options are not used.
 
 When set to `sftp`, files are uploaded to a remote host using SFTP. The
 `--sftp-*` family of options can be used to setup the access to the host. The
@@ -176,6 +176,10 @@ is used to decrypt it and the password authentication method is not tried with
 the server. The only SSH authentication methods used are password and
 publickey. If an SSH agent is available, it is always used.
 
+When set to `gcs`, files are uploaded to Google Cloud Storage. The `--gcs-*`
+family of options can be used to setup access to the bucket. When `--gcs-keyfile`
+is empty, `GOOGLE_APPLICATION_CREDENTIALS` environment is used.
+
 The `--purge-remote` option can be set to `yes` to apply the same purge policy
 on the remote location as the local directory.
 
diff --git a/config.go b/config.go
index 8a8712f..d8d53b4 100644
--- a/config.go
+++ b/config.go
@@ -76,7 +76,7 @@ type options struct {
 	CipherPassphrase string
 	Decrypt          bool
 
-	Upload       string // values are none, s3, sftp
+	Upload       string // values are none, s3, sftp, gcs
 	PurgeRemote  bool
 	S3Region     string
 	S3Bucket     string
@@ -94,6 +94,10 @@ type options struct {
 	SFTPDirectory        string
 	SFTPIdentityFile     string // path to private key
 	SFTPIgnoreKnownHosts bool
+
+	GCSBucket          string
+	GCSEndPoint        string
+	GCSCredentialsFile string
 }
 
 func defaultOptions() options {
@@ -266,6 +270,10 @@ func parseCli(args []string) (options, []string, error) {
 	pflag.StringVar(&opts.SFTPIdentityFile, "sftp-identity", "", "Path to a private key")
 	SFTPIgnoreHostKey := pflag.String("sftp-ignore-hostkey", "no", "Check the target host key against local known hosts")
 
+	pflag.StringVar(&opts.GCSBucket, "gcs-bucket", "", "GCS bucket name")
+	pflag.StringVar(&opts.GCSEndPoint, "gcs-endpoint", "", "GCS endpoint URL")
+	pflag.StringVar(&opts.GCSCredentialsFile, "gcs-keyfile", "", "path to the GCS credentials file")
+
 	pflag.StringVarP(&opts.Host, "host", "h", "", "database server host or socket directory")
 	pflag.IntVarP(&opts.Port, "port", "p", 0, "database server port number")
 	pflag.StringVarP(&opts.Username, "username", "U", "", "connect as specified database user")
@@ -393,7 +401,7 @@ func parseCli(args []string) (options, []string, error) {
 	}
 
 	// Validate upload option
-	stores := []string{"none", "s3", "sftp"}
+	stores := []string{"none", "s3", "sftp", "gcs"}
 	if err := validateEnum(opts.Upload, stores); err != nil {
 		return opts, changed, fmt.Errorf("invalid value for --upload: %s", err)
 	}
@@ -486,6 +494,10 @@ func loadConfigurationFile(path string) (options, error) {
 	opts.SFTPIdentityFile = s.Key("sftp_identity").MustString("")
 	opts.SFTPIgnoreKnownHosts = s.Key("sftp_ignore_hostkey").MustBool(false)
 
+	opts.GCSBucket = s.Key("gcs_bucket").MustString("")
+	opts.GCSEndPoint = s.Key("gcs_endpoint").MustString("")
+	opts.GCSCredentialsFile = s.Key("gcs_keyfile").MustString("")
+
 	// Validate purge keep and time limit
 	keep, err := validatePurgeKeepValue(purgeKeep)
 	if err != nil {
@@ -517,7 +529,7 @@ func loadConfigurationFile(path string) (options, error) {
 	}
 
 	// Validate upload option
-	stores := []string{"none", "s3", "sftp"}
+	stores := []string{"none", "s3", "sftp", "gcs"}
 	if err := validateEnum(opts.Upload, stores); err != nil {
 		return opts, fmt.Errorf("invalid value for upload: %s", err)
 	}
@@ -728,6 +740,13 @@ func mergeCliAndConfigOptions(cliOpts options, configOpts options, onCli []strin
 		case "sftp-ignore-hostkey":
 			opts.SFTPIgnoreKnownHosts = cliOpts.SFTPIgnoreKnownHosts
 
+		case "gcs-bucket":
+			opts.GCSBucket = cliOpts.GCSBucket
+		case "gcs-endpoint":
+			opts.GCSEndPoint = cliOpts.GCSEndPoint
+		case "gcs-keyfile":
+			opts.GCSCredentialsFile = cliOpts.GCSCredentialsFile
+
 		case "host":
 			opts.Host = cliOpts.Host
 		case "port":
diff --git a/config_test.go b/config_test.go
index dd8ed9a..ea2a2b5 100644
--- a/config_test.go
+++ b/config_test.go
@@ -375,7 +375,7 @@ func TestParseCli(t *testing.T) {
 				},
 				false,
 				false,
-				"invalid value for --upload: value not found in [none s3 sftp]",
+				"invalid value for --upload: value not found in [none s3 sftp gcs]",
 				"",
 			},
 		}
diff --git a/go.mod b/go.mod
index b1cac82..1124f23 100644
--- a/go.mod
+++ b/go.mod
@@ -3,15 +3,17 @@ module github.com/orgrim/pg_back
 go 1.16
 
 require (
+	cloud.google.com/go/storage v1.18.2 // indirect
 	filippo.io/age v1.0.0 // indirect
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	github.com/aws/aws-sdk-go v1.42.12 // indirect
-	github.com/google/go-cmp v0.5.4
+	github.com/google/go-cmp v0.5.6
 	github.com/jackc/pgconn v1.8.1 // indirect
 	github.com/jackc/pgtype v1.7.0
 	github.com/jackc/pgx/v4 v4.11.0
 	github.com/pkg/sftp v1.13.4 // indirect
 	github.com/spf13/pflag v1.0.5
 	golang.org/x/crypto v0.0.0-20211202192323-5770296d904e // indirect
+	google.golang.org/api v0.63.0 // indirect
 	gopkg.in/ini.v1 v1.62.0
 )
diff --git a/go.sum b/go.sum
index 7cc0561..d66ac65 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,62 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
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 github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
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@@ -17,6 +67,7 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
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@@ -35,9 +86,17 @@ github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kB
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@@ -59,13 +118,22 @@ github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1
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@@ -83,21 +151,81 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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@@ -107,6 +235,7 @@ github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
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@@ -129,6 +258,8 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
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 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
 github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0=
@@ -191,6 +322,8 @@ github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/json-iterator/go v1.1.8/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
+github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
+github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk=
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
@@ -295,6 +428,7 @@ github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsT
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
+github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
 github.com/rs/zerolog v1.13.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OKkWU=
@@ -317,6 +451,7 @@ github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIK
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
 github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
 github.com/sony/gobreaker v0.4.1/go.mod h1:ZKptC7FHNvhBz7dN2LGjPVBz2sZJmc0/PkyDJOjmxWY=
+github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
@@ -332,17 +467,31 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
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 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
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 github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
 go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
+go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
+go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
+go.opencensus.io v0.23.0 h1:gqCw0LfLxScz8irSi8exQc7fyQ0fKQU/qnC/X8+V/1M=
+go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
@@ -359,11 +508,13 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2 h1:It14KIkyBFYkHkwZ7k45minvA9aorojkyjGk9KJ5B/w=
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
@@ -372,13 +523,40 @@ golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.0.0-20211202192323-5770296d904e h1:MUP6MR3rJ7Gk9LEia0LP2ytiH6MuCfs7qYz+47jGdD8=
 golang.org/x/crypto v0.0.0-20211202192323-5770296d904e/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
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+golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -391,21 +569,70 @@ golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73r
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+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -498,11 +957,19 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 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=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/main.go b/main.go
index 6940bb6..3db4bbe 100644
--- a/main.go
+++ b/main.go
@@ -437,6 +437,11 @@ func run() (retVal error) {
 		if err != nil {
 			return fmt.Errorf("failed to prepare upload over SFTP: %w", err)
 		}
+	case "gcs":
+		repo, err = NewGCSRepo(opts)
+		if err != nil {
+			return fmt.Errorf("failed to prepare upload to GCS: %w", err)
+		}
 	}
 
 	for _, dbname := range databases {
@@ -1220,6 +1225,13 @@ func postProcessFiles(inFiles chan sumFileJob, wg *sync.WaitGroup, opts options)
 			ret <- err
 			repo = nil
 		}
+	case "gcs":
+		repo, err = NewGCSRepo(opts)
+		if err != nil {
+			l.Errorln("failed to prepare upload to GCS:", err)
+			ret <- err
+			repo = nil
+		}
 	}
 
 	for i := 0; i < opts.Jobs; i++ {
diff --git a/pg_back.conf b/pg_back.conf
index 51d6724..1fe7ecd 100644
--- a/pg_back.conf
+++ b/pg_back.conf
@@ -96,7 +96,7 @@ pre_backup_hook =
 post_backup_hook =
 
 # Upload resulting files to a remote location. Possible values are: none,
-# s3. The default is none, meaning no file will be uploaded.
+# s3, sftp, gcs. The default is none, meaning no file will be uploaded.
 upload = none
 
 # Purge remote files. When uploading to a remote location, purge the remote
@@ -129,6 +129,13 @@ upload = none
 # sftp_identity =
 # sftp_ignore_hostkey = false
 
+# Google Cloud Storage (GCS) Access information. Bucket is mandatory. If the
+# path to the key file is empty, the GOOGLE_APPLICATION_CREDENTIALS environment
+# variable is used.
+# gcs_bucket =
+# gcs_endpoint =
+# gcs_keyfile
+
 # # Per database options. Use a ini section named the same as the
 # # database. These options take precedence over the global values
 # [dbname]
diff --git a/upload.go b/upload.go
index d012e31..605bf61 100644
--- a/upload.go
+++ b/upload.go
@@ -26,6 +26,8 @@
 package main
 
 import (
+	"cloud.google.com/go/storage"
+	"context"
 	"errors"
 	"fmt"
 	"github.com/aws/aws-sdk-go/aws"
@@ -37,6 +39,8 @@ import (
 	"golang.org/x/crypto/ssh"
 	"golang.org/x/crypto/ssh/agent"
 	"golang.org/x/crypto/ssh/knownhosts"
+	"google.golang.org/api/iterator"
+	"google.golang.org/api/option"
 	"io"
 	"net"
 	"os"
@@ -498,3 +502,93 @@ func (r *sftpRepo) Remove(path string) error {
 
 	return nil
 }
+
+type gcsRepo struct {
+	bucket  string
+	url     string // Endpoint URL
+	keyFile string
+	client  *storage.Client
+}
+
+func NewGCSRepo(opts options) (*gcsRepo, error) {
+	r := &gcsRepo{
+		bucket:  opts.GCSBucket,
+		url:     opts.GCSEndPoint,
+		keyFile: opts.GCSCredentialsFile,
+	}
+
+	options := make([]option.ClientOption, 0)
+	if r.url != "" {
+		options = append(options, option.WithEndpoint(r.url))
+	}
+
+	if r.keyFile != "" {
+		options = append(options, option.WithCredentialsFile(r.keyFile))
+	}
+
+	client, err := storage.NewClient(context.Background(), options...)
+	if err != nil {
+		return nil, fmt.Errorf("could not create GCS client: %w", err)
+	}
+
+	r.client = client
+
+	return r, nil
+}
+
+func (r *gcsRepo) Close() error {
+	return r.client.Close()
+}
+
+func (r *gcsRepo) Upload(path string, target string) error {
+	file, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("upload error: %w", err)
+	}
+	defer file.Close()
+
+	obj := r.client.Bucket(r.bucket).Object(target).NewWriter(context.Background())
+	defer obj.Close()
+
+	l.Infof("uploading %s to GCS bucket %s\n", path, r.bucket)
+	if _, err := io.Copy(obj, file); err != nil {
+		return fmt.Errorf("could not write data to GCS object: %w", err)
+	}
+
+	// The upload is done asynchronously, the error returned by Close()
+	// says if it was successful
+	return obj.Close()
+}
+
+func (r *gcsRepo) List(prefix string) (items []Item, rerr error) {
+	items = make([]Item, 0)
+
+	it := r.client.Bucket(r.bucket).Objects(context.Background(), &storage.Query{Prefix: prefix})
+	for {
+		attrs, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+
+		if err != nil {
+			l.Warnln("could not list remote file:", err)
+			rerr = err
+			break
+		}
+
+		items = append(items, Item{
+			key:     attrs.Name,
+			modtime: attrs.Updated,
+		})
+	}
+
+	return
+}
+
+func (r *gcsRepo) Remove(path string) error {
+	if err := r.client.Bucket(r.bucket).Object(path).Delete(context.Background()); err != nil {
+		return fmt.Errorf("could not remove %s from GCS bucket %s: %w", path, r.bucket, err)
+	}
+
+	return nil
+}