Slack file upload plugin feature (#174)

* adding slack file send

* added all file send params

* adding slack file upload

* adding test files

* modifed plugin tests to check for request body similar to previous cases

* adding output env vars

* updating slack file upload instructions

* handling filename arg is empty case

* Update plugin.go

done

Co-authored-by: OP (oppenheimer) <[email protected]>

* not creating any tmp files if DRONE_OUTPUT not set

* Update README.md

* Update README.md

* Update plugin.go

* Update README.md

---------

Co-authored-by: OP (oppenheimer) <[email protected]>

Author: senthilhns

.gitignore

@@ -28,3 +28,5 @@ vendor/
 
 coverage.out
 drone-slack
+
+.idea

README.md

@@ -26,7 +26,9 @@ GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -a -tags netgo -o release/linux/a
 docker build --rm -t plugins/slack .
 ```
 
-## Usage
+## Send Slack messages Usage
+
+To Send Slack messages use the following
 
 Execute from the working directory:
 
@@ -50,7 +52,6 @@ docker run --rm \
   plugins/slack
 ```
 
-
 Please note the following new environment variables:
 
 - `SLACK_ACCESS_TOKEN`: The access token for Slack API authentication.
@@ -60,6 +61,33 @@ Make sure to replace `your_access_token` with your actual Slack access token and
 
 If you provide an access token, it will use the Slack API to send the message. Otherwise, it will use the webhook.
 
+
+## Upload files to Slack
+
+To Send Slack messages use the following
+
+Execute from the working directory:
+```
+docker run --network host --rm \
+  -e PLUGIN_ACCESS_TOKEN=your_access_token   \
+  -e PLUGIN_CHANNEL=C07TL1KNV8Q \
+  -e PLUGIN_USERNAME=jenkinstest003app \
+  -e PLUGIN_FILE_PATH='/home/hns/test/b.txt' \
+  -e PLUGIN_INITIAL_COMMENT='some start of text' \
+  -e PLUGIN_TITLE='Build OK now' \
+  plugins/slack
+```
+
+Please note the following new environment variables:
+
+- `PLUGIN_ACCESS_TOKEN`: The access token for Slack API authentication.
+- `PLUGIN_CUSTOM_BLOCK`: Custom blocks in JSON format to include in the Slack message.
+
+Make sure to replace `your_access_token` with your actual Slack access token and adjust
+
+If you provide an access token, it will use the Slack API to send the message.
+
+
 ## Release Preparation
 
 Run the changelog generator.

go.mod

@@ -5,9 +5,8 @@ go 1.20
 require (
 	github.com/drone/drone-template-lib v1.0.0
 	github.com/joho/godotenv v1.5.1
-	github.com/slack-go/slack v0.12.2
+	github.com/slack-go/slack v0.15.0
 	github.com/urfave/cli v1.22.14
-	github.com/urfave/cli/v2 v2.25.7
 	gotest.tools/v3 v3.5.1
 )
 
@@ -19,7 +18,7 @@ require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/uuid v1.1.0 // indirect
-	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/huandu/xstrings v1.2.0 // indirect
 	github.com/imdario/mergo v0.3.7 // indirect
 	github.com/pkg/errors v0.8.0 // indirect

go.sum

@@ -1,4 +1,3 @@
-github.com/BurntSushi/toml v1.2.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/Masterminds/goutils v1.1.0 h1:zukEsf/1JZwCMgHiK3GZftabmxiCw4apj3a28RPBiVg=
 github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
@@ -19,15 +18,14 @@ github.com/drone/drone-template-lib v1.0.0 h1:PNBBfUhifRnrPCoWBlTitk3jipXdv8u8WL
 github.com/drone/drone-template-lib v1.0.0/go.mod h1:Hqy1tgqPH5mtbFOZmow19l4jOkZvp+WZ00cB4W3MJhg=
 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/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
 github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.1.0 h1:Jf4mxPC/ziBnoPIdpQdPJ9OeiomAUHLvxmPRSPH9m4s=
 github.com/google/uuid v1.1.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-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/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/huandu/xstrings v1.2.0 h1:yPeWdRnmynF7p+lLYz0H2tthW9lqhMJrQV/U7yy4wX0=
 github.com/huandu/xstrings v1.2.0/go.mod h1:DvyZB1rfVYsBIigL8HwpZgxHwXozlTgGqn63UyNX5k4=
 github.com/imdario/mergo v0.3.7 h1:Y+UAYTZ7gDEuOfhxKWy+dvb5dRQ6rJjFSdX2HZY1/gI=
@@ -40,59 +38,34 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/slack-go/slack v0.12.2 h1:x3OppyMyGIbbiyFhsBmpf9pwkUzMhthJMRNmNlA4LaQ=
-github.com/slack-go/slack v0.12.2/go.mod h1:hlGi5oXA+Gt+yWTPP0plCdRKmjsDxecdHxYQdlMQKOw=
+github.com/slack-go/slack v0.15.0 h1:LE2lj2y9vqqiOf+qIIy0GvEoxgF1N5yLGZffmEZykt0=
+github.com/slack-go/slack v0.15.0/go.mod h1:hlGi5oXA+Gt+yWTPP0plCdRKmjsDxecdHxYQdlMQKOw=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
-github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/tkuchiki/faketime v0.0.0-20170607100027-a4500a4f4643 h1:ii/sHfgFMByozryLeiDmn1ClZ/Pena4NgpJ4P7UuX9o=
 github.com/tkuchiki/faketime v0.0.0-20170607100027-a4500a4f4643/go.mod h1:RXY/TXAwGGL36IKDjrHFMcjpUrEiyWSEtLhFPw3UWF0=
-github.com/urfave/cli v1.22.13 h1:wsLILXG8qCJNse/qAgLNf23737Cx05GflHg/PJGe1Ok=
-github.com/urfave/cli v1.22.13/go.mod h1:VufqObjsMTF2BBwKawpx9R8eAneNEWhoO0yx8Vd+FkE=
 github.com/urfave/cli v1.22.14 h1:ebbhrRiGK2i4naQJr+1Xj92HXZCrK7MsyTS/ob3HnAk=
 github.com/urfave/cli v1.22.14/go.mod h1:X0eDS6pD6Exaclxm99NJ3FiCDRED7vIHpx2mDOHLvkA=
-github.com/urfave/cli/v2 v2.25.7/go.mod h1:8qnjx1vcq5s2/wpsqoZFndg2CE5tNFyrTvS6SinrnYQ=
-github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gotest.tools/v3 v3.4.0 h1:ZazjZUfuVeZGLAmlKKuyv3IKP5orXcwtOwDQH6YVr6o=
-gotest.tools/v3 v3.4.0/go.mod h1:CtbdzLSsqVhDgMtKsx03ird5YTGB3ar27v0u/yKBW5g=
-gotest.tools/v3 v3.5.0 h1:Ljk6PdHdOhAb5aDMWXjDLMMhph+BpztA4v1QdqEW2eY=
-gotest.tools/v3 v3.5.0/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=
 gotest.tools/v3 v3.5.1 h1:EENdUnS3pdur5nybKYIh2Vfgc8IUNBjxDPSjtiJcOzU=
 gotest.tools/v3 v3.5.1/go.mod h1:isy3WKz7GK6uNw/sbHzfKBLvlvXwUyV06n6brMxxopU=

main.go

@@ -212,6 +212,33 @@ func main() {
 			Usage:  "slack message. either this or the custom template must be set. ",
 			EnvVar: "PLUGIN_MESSAGE",
 		},
+
+		// File send params
+		cli.StringFlag{
+			Name:   "filepath",
+			Usage:  "slack file path",
+			EnvVar: "PLUGIN_FILE_PATH",
+		},
+		cli.StringFlag{
+			Name:   "filename",
+			Usage:  "slack file name",
+			EnvVar: "PLUGIN_FILE_NAME",
+		},
+		cli.StringFlag{
+			Name:   "title",
+			Usage:  "slack title",
+			EnvVar: "PLUGIN_TITLE",
+		},
+		cli.StringFlag{
+			Name:   "initial_comment",
+			Usage:  "slack initial comment",
+			EnvVar: "PLUGIN_INITIAL_COMMENT",
+		},
+		cli.BoolFlag{
+			Name:   "fail_on_error",
+			Usage:  "fail build on error",
+			EnvVar: "PLUGIN_FAIL_ON_ERROR",
+		},
 	}
 
 	if _, err := os.Stat("/run/drone/env"); err == nil {
@@ -271,8 +298,15 @@ func run(c *cli.Context) error {
 			Mentions:       c.String("mentions"),
 			CustomTemplate: c.String("custom.template"),
 			Message:        c.String("message"),
+			// File upload attributes
+			FilePath:       c.String("filepath"),
+			FileName:       c.String("filename"),
+			Title:          c.String("title"),
+			InitialComment: c.String("initial_comment"),
+			FailOnError:    c.Bool("fail_on_error"),
 		},
 	}
+
 	if plugin.Build.Commit == "" {
 		plugin.Build.Commit = "0000000000000000000000000000000000000000"
 	}

plugin.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 	textTemplate "text/template"
 
@@ -70,6 +71,12 @@ type (
 		Mentions       string
 		CustomTemplate string
 		Message        string
+		// File Upload attributes
+		FilePath       string
+		FileName       string
+		InitialComment string
+		Title          string
+		FailOnError    bool
 	}
 
 	Job struct {
@@ -111,6 +118,10 @@ func (p Plugin) Exec() error {
 	var text string
 	var fallbackText string
 
+	if p.Config.FilePath != "" {
+		return p.UploadFile()
+	}
+
 	// Determine the channel
 	if p.Config.Recipient != "" {
 		channel = prepend("@", p.Config.Recipient)
@@ -307,6 +318,120 @@ func (p Plugin) Exec() error {
 	return slack.PostWebhook(p.Config.Webhook, &payload)
 }
 
+func (p Plugin) UploadFile() error {
+
+	p.Config.FilePath = strings.TrimSpace(p.Config.FilePath)
+
+	api := slack.New(p.Config.AccessToken)
+	fileSize, err := GetFileSize(p.Config.FilePath)
+	if err != nil {
+		fmt.Printf("Error getting file size: %s\n", err.Error())
+		return err
+	}
+
+	if p.Config.FileName == "" {
+		fileName := filepath.Base(p.Config.FilePath)
+		p.Config.FileName = fileName
+	}
+
+	params := slack.UploadFileV2Parameters{
+		File:           p.Config.FilePath,
+		Channel:        p.Config.Channel,
+		Filename:       p.Config.FileName,
+		Title:          p.Config.Title,
+		InitialComment: p.Config.InitialComment,
+		FileSize:       fileSize,
+	}
+
+	slackSummary, err := api.UploadFileV2(params)
+
+	if !p.Config.FailOnError && slackSummary == nil {
+		if err != nil {
+			fmt.Println("Bad Api ret val, upload file failed but passing build as PLUGIN_FAIL_ON_ERROR is false")
+		}
+		return nil
+	} else if p.Config.FailOnError && slackSummary == nil {
+		fmt.Println("Bad ret val,  Failed to upload file, failing build")
+		_ = p.WriteFileUploadResult("", "", err)
+		return fmt.Errorf("Bad ret val, Failed to upload file %s ", p.Config.FilePath)
+	}
+
+	if !p.Config.FailOnError && err != nil {
+		if err != nil {
+			fmt.Println("Unable to upload file but passing build PLUGIN_FAIL_ON_ERROR is false")
+		}
+		return nil
+	} else if p.Config.FailOnError && err != nil {
+		fmt.Println("Upload API Failed to upload file, failing build")
+		_ = p.WriteFileUploadResult("", "", err)
+		return fmt.Errorf("Failed to upload file %s ", p.Config.FilePath)
+	}
+
+	err = p.WriteFileUploadResult(slackSummary.ID, slackSummary.Title, err)
+	if !p.Config.FailOnError {
+		if err != nil {
+			fmt.Println("Unable to Write output env var results for file upload " +
+				"but passing build PLUGIN_FAIL_ON_ERROR is false")
+		}
+		return nil
+	}
+
+	return nil
+}
+
+func (p Plugin) WriteFileUploadResult(slackFileId, title string, err error) error {
+
+	type EnvKvPair struct {
+		Key   string
+		Value string
+	}
+
+	resultStr := "Failed: Slack file upload failed"
+	if err == nil {
+		resultStr = "Success: Slack file upload successful"
+	}
+
+	var kvPairs = []EnvKvPair{
+		{Key: "UPLOAD_OK_STATUS", Value: resultStr},
+		{Key: "UPLOAD_FILE_PATH", Value: p.Config.FilePath},
+	}
+
+	var retErr error = nil
+
+	for _, kvPair := range kvPairs {
+		err := WriteEnvToOutputFile(kvPair.Key, kvPair.Value)
+		if err != nil {
+			retErr = err
+		}
+	}
+
+	return retErr
+}
+
+func WriteEnvToOutputFile(key, value string) error {
+	outputFile, err := os.OpenFile(os.Getenv("DRONE_OUTPUT"), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open output file: %w", err)
+	}
+	defer outputFile.Close()
+	_, err = fmt.Fprintf(outputFile, "%s=%s\n", key, value)
+	if err != nil {
+		return fmt.Errorf("failed to write to env: %w", err)
+	}
+	return nil
+}
+
+func GetFileSize(filePath string) (int, error) {
+	fileInfo, err := os.Stat(filePath)
+	if err != nil {
+		return 0, fmt.Errorf("failed to get file info: %w", err)
+	}
+	if fileInfo.IsDir() {
+		return 0, fmt.Errorf("path %s is a directory, not a file", filePath)
+	}
+	return int(fileInfo.Size()), nil
+}
+
 func templateMessage(t string, plugin Plugin) (string, error) {
 	c, err := contents(t)
 	if err != nil {