feat: Add gitlab_repository_file data source

This data source is part of Gitlab API.

Closes: #927

Author: Petr Vála

docs/data-sources/repository_file.md

@@ -0,0 +1,39 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "gitlab_repository_file Data Source - terraform-provider-gitlab"
+subcategory: ""
+description: |-
+  Allows you to receive information about file in repository like name, size, content. File content is Base64 encoded. This endpoint can be accessed without authentication if the repository is publicly accessible.
+---
+
+# gitlab_repository_file (Data Source)
+
+Allows you to receive information about file in repository like name, size, content. File content is Base64 encoded. This endpoint can be accessed without authentication if the repository is publicly accessible.
+
+
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- **file_path** (String) The full path of the file. It must be relative to the root of the project without a leading slash `/`.
+- **project** (String) The ID of the project.
+- **ref** (String) The name of branch, tag or commit.
+
+### Optional
+
+- **id** (String) The ID of this resource.
+
+### Read-Only
+
+- **blob_id** (String) String, blob id.
+- **commit_id** (String) String, commit id.
+- **content** (String) String, base64 encoded file content.
+- **content_sha256** (String) String, content sha256 digest.
+- **encoding** (String) String, file encoding.
+- **file_name** (String) String, file name.
+- **last_commit_id** (String) String, last commit id.
+- **size** (Number) Integer, file size.
+
+

internal/provider/data_source_gitlab_repository_file.go

@@ -0,0 +1,107 @@
+package provider
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+	gitlab "github.com/xanzy/go-gitlab"
+)
+
+var _ = registerDataSource("gitlab_repository_file", func() *schema.Resource {
+	return &schema.Resource{
+		Description: "Allows you to receive information about file in repository like name, size, content. File content is Base64 encoded. This endpoint can be accessed without authentication if the repository is publicly accessible.",
+		ReadContext: dataSourceGitlabRepositoryFileRead,
+		Schema: map[string]*schema.Schema{
+			"project": {
+				Description: "The ID of the project.",
+				Type:        schema.TypeString,
+				Required:    true,
+			},
+			"file_path": {
+				Description: "The full path of the file. It must be relative to the root of the project without a leading slash `/`.",
+				Type:        schema.TypeString,
+				Required:    true,
+			},
+			"ref": {
+				Description: "The name of branch, tag or commit.",
+				Type:        schema.TypeString,
+				Required:    true,
+			},
+			"file_name": {
+				Description: "String, file name.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"size": {
+				Description: "Integer, file size.",
+				Type:        schema.TypeInt,
+				Computed:    true,
+			},
+			"encoding": {
+				Description: "String, file encoding.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"content": {
+				Description: "String, base64 encoded file content.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"content_sha256": {
+				Description: "String, content sha256 digest.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"blob_id": {
+				Description: "String, blob id.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"commit_id": {
+				Description: "String, commit id.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+			"last_commit_id": {
+				Description: "String, last commit id.",
+				Type:        schema.TypeString,
+				Computed:    true,
+			},
+		},
+	}
+})
+
+func dataSourceGitlabRepositoryFileRead(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
+	client := meta.(*gitlab.Client)
+	project := d.Get("project").(string)
+	filePath := d.Get("file_path").(string)
+
+	options := &gitlab.GetFileOptions{
+		Ref: gitlab.String(d.Get("ref").(string)),
+	}
+
+	repositoryFile, resp, err := client.RepositoryFiles.GetFile(project, filePath, options, gitlab.WithContext(ctx))
+	if err != nil {
+		log.Printf("[DEBUG] file %s not found, response %v", filePath, resp)
+		return diag.FromErr(err)
+	}
+
+	d.SetId(fmt.Sprintf("%s:%s:%s", project, repositoryFile.Ref, repositoryFile.FilePath))
+
+	d.Set("project", project)
+	d.Set("file_name", repositoryFile.FileName)
+	d.Set("file_path", repositoryFile.FilePath)
+	d.Set("size", repositoryFile.Size)
+	d.Set("encoding", repositoryFile.Encoding)
+	d.Set("content", repositoryFile.Content)
+	d.Set("content_sha256", repositoryFile.SHA256)
+	d.Set("ref", repositoryFile.Ref)
+	d.Set("blob_id", repositoryFile.BlobID)
+	d.Set("commit_id", repositoryFile.CommitID)
+	d.Set("last_commit_id", repositoryFile.LastCommitID)
+
+	return nil
+}

internal/provider/data_source_gitlab_repository_file_test.go

@@ -0,0 +1,76 @@
+package provider
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
+)
+
+func TestAccDataGitlabRepositoryFile_basic(t *testing.T) {
+	testAccCheck(t)
+	project := testAccCreateProject(t)
+	resource.Test(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t) },
+		ProviderFactories: providerFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccDataGitlabRepositoryFile(project.PathWithNamespace),
+				Check: resource.ComposeTestCheckFunc(
+					testAccDataSourceGitlabRepositoryFile("gitlab_repository_file.foo", "data.gitlab_repository_file.foo"),
+				),
+			},
+		},
+	})
+}
+
+func testAccDataSourceGitlabRepositoryFile(src, n string) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+
+		file := s.RootModule().Resources[src]
+		fileAttr := file.Primary.Attributes
+
+		search := s.RootModule().Resources[n]
+		searchAttr := search.Primary.Attributes
+
+		testAttributes := []string{
+			"project",
+			"file_path",
+			"file_path",
+			"size",
+			"encoding",
+			"content",
+			"ref",
+			"blob_id",
+			"commit_id",
+			"content_sha256",
+			"last_commit_id",
+		}
+
+		for _, attribute := range testAttributes {
+			if searchAttr[attribute] != fileAttr[attribute] {
+				return fmt.Errorf("expected file's parameter `%s` to be: %s, but got: `%s`", attribute, fileAttr[attribute], searchAttr[attribute])
+			}
+		}
+		return nil
+	}
+}
+
+func testAccDataGitlabRepositoryFile(project string) string {
+	return fmt.Sprintf(`
+resource "gitlab_repository_file" "foo" {
+	project = "%s"
+	file_path = "testfile-meow"
+	branch = "main"
+	content = base64encode("Meow goes the cat")
+	commit_message = "feat: Meow"
+}
+
+data "gitlab_repository_file" "foo" {
+  project = %s
+  file_path = "testfile-meow"
+  ref = "main"
+}
+`, project, project)
+}