all: implement HTTP API to decrypt file

Similar to the CLI, the HTTP API accept the path of vault file
and return the path to decrypted file.

4 files changed, 229 insertions, 4 deletions

diff --git a/http_server.go b/http_server.go
index b823204..30dd52a 100644
--- a/http_server.go
+++ b/http_server.go
@@ -21,7 +21,9 @@ import (
 	"git.sr.ht/~shulhan/awwan/internal"
 )
 
+// List of available HTTP API.
 const (
+	pathAwwanApiDecrypt = `/awwan/api/decrypt`
 	pathAwwanApiEncrypt = `/awwan/api/encrypt`
 	pathAwwanApiExecute = `/awwan/api/execute`
 	pathAwwanApiFs      = `/awwan/api/fs`
@@ -136,16 +138,28 @@ func (httpd *httpServer) registerEndpoints() (err error) {
 		return fmt.Errorf("%s: %w", logp, err)
 	}
 
-	var ep = libhttp.Endpoint{
+	var epDecrypt = libhttp.Endpoint{
+		Method:       libhttp.RequestMethodPost,
+		Path:         pathAwwanApiDecrypt,
+		RequestType:  libhttp.RequestTypeJSON,
+		ResponseType: libhttp.ResponseTypeJSON,
+		Call:         httpd.Decrypt,
+	}
+	err = httpd.RegisterEndpoint(&epDecrypt)
+	if err != nil {
+		return fmt.Errorf(`%s %q: %w`, logp, epDecrypt.Path, err)
+	}
+
+	var epEncrypt = libhttp.Endpoint{
 		Method:       libhttp.RequestMethodPost,
 		Path:         pathAwwanApiEncrypt,
 		RequestType:  libhttp.RequestTypeJSON,
 		ResponseType: libhttp.ResponseTypeJSON,
 		Call:         httpd.Encrypt,
 	}
-	err = httpd.RegisterEndpoint(&ep)
+	err = httpd.RegisterEndpoint(&epEncrypt)
 	if err != nil {
-		return fmt.Errorf(`%s %q: %w`, logp, ep.Path, err)
+		return fmt.Errorf(`%s %q: %w`, logp, epEncrypt.Path, err)
 	}
 
 	err = httpd.RegisterEndpoint(&libhttp.Endpoint{
@@ -169,6 +183,86 @@ func (httpd *httpServer) start() (err error) {
 	return httpd.Server.Start()
 }
 
+// Decrypt the file by path.
+//
+// Request format,
+//
+//	POST /awwan/api/decrypt
+//	Content-Type: application/json
+//
+//	{"path_vault":<string>}
+//
+// On success it will return the path to decrypted file.
+//
+//	Content-Type: application/json
+//
+//	{
+//		"code": 200,
+//		"data": {
+//			"path": <string>,
+//			"path_vault": <string>,
+//		}
+//	}
+func (httpd *httpServer) Decrypt(epr *libhttp.EndpointRequest) (resb []byte, err error) {
+	var (
+		logp    = `Decrypt`
+		httpRes = &libhttp.EndpointResponse{}
+
+		decRes encryptResponse
+	)
+
+	err = json.Unmarshal(epr.RequestBody, &decRes)
+	if err != nil {
+		return nil, fmt.Errorf(`%s: %w`, logp, err)
+	}
+
+	httpRes.Code = http.StatusBadRequest
+
+	decRes.PathVault = strings.TrimSpace(decRes.PathVault)
+	if len(decRes.PathVault) == 0 {
+		httpRes.Message = fmt.Sprintf(`%s: empty path_vault`, logp)
+		return nil, httpRes
+	}
+
+	var nodeVault *memfs.Node
+
+	nodeVault, err = httpd.memfsBase.Get(decRes.PathVault)
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			httpRes.Message = fmt.Sprintf(`%s %q: %s`, logp, decRes.PathVault, fs.ErrNotExist)
+		} else {
+			httpRes.Message = fmt.Sprintf(`%s: %s`, logp, err)
+		}
+		return nil, httpRes
+	}
+	if nodeVault.IsDir() {
+		httpRes.Message = fmt.Sprintf(`%s: %q is a directory`, logp, decRes.PathVault)
+		return nil, httpRes
+	}
+
+	httpRes.Code = http.StatusInternalServerError
+
+	decRes.Path, err = httpd.aww.Decrypt(nodeVault.SysPath)
+	if err != nil {
+		httpRes.Message = fmt.Sprintf(`%s: %s`, logp, err)
+		return nil, httpRes
+	}
+
+	nodeVault.Parent.Update(nil, 0)
+
+	decRes.Path, _ = strings.CutPrefix(decRes.Path, httpd.aww.BaseDir)
+
+	httpRes.Code = http.StatusOK
+	httpRes.Data = decRes
+
+	resb, err = json.Marshal(&httpRes)
+	if err != nil {
+		return nil, err
+	}
+
+	return resb, nil
+}
+
 // Encrypt the file by path.
 //
 // Request format,
diff --git a/http_server_test.go b/http_server_test.go
index ab036c6..159c166 100644
--- a/http_server_test.go
+++ b/http_server_test.go
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2023 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 package awwan
 
 import (
@@ -12,6 +15,94 @@ import (
 	"github.com/shuLhan/share/lib/test"
 )
 
+func TestHttpServer_Decrypt(t *testing.T) {
+	type testCase struct {
+		desc    string
+		expResp string
+		expErr  string
+		reqBody []byte
+	}
+
+	var (
+		tdata *test.Data
+		err   error
+	)
+
+	tdata, err = test.LoadData(`testdata/http_server/decrypt_test.data`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var aww *Awwan
+
+	aww, err = New(`testdata/encrypt-with-passfile`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var httpd *httpServer
+
+	httpd, err = newHttpServer(aww, ``)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var endpointDecrypt = &libhttp.Endpoint{
+		Method:       libhttp.RequestMethodPost,
+		Path:         pathAwwanApiDecrypt,
+		RequestType:  libhttp.RequestTypeJSON,
+		ResponseType: libhttp.ResponseTypeJSON,
+	}
+
+	var cases = []testCase{{
+		desc:    `With valid request`,
+		reqBody: tdata.Input[`withValidRequest/body`],
+		expResp: string(tdata.Output[`withValidRequest/Response/body`]),
+	}, {
+		desc:    `With empty value`,
+		reqBody: tdata.Input[`withEmptyValue/body`],
+		expResp: string(tdata.Output[`withEmptyValue/Response/body`]),
+	}, {
+		desc:    `With directory`,
+		reqBody: tdata.Input[`withDirectory/body`],
+		expResp: string(tdata.Output[`withDirectory/Response/body`]),
+	}, {
+		desc:    `With file not exist`,
+		reqBody: tdata.Input[`withFileNotExist/body`],
+		expResp: string(tdata.Output[`withFileNotExist/Response/body`]),
+	}}
+
+	var (
+		httpReq *http.Request
+		httpRes *http.Response
+		c       testCase
+		reqBody bytes.Buffer
+		gotResp bytes.Buffer
+		resp    []byte
+	)
+
+	for _, c = range cases {
+		t.Log(c.desc)
+
+		reqBody.Reset()
+		reqBody.Write(c.reqBody)
+
+		httpReq = httptest.NewRequest(http.MethodPost, endpointDecrypt.Path, &reqBody)
+
+		var httpWriter = httptest.NewRecorder()
+
+		httpd.ServeHTTP(httpWriter, httpReq)
+
+		httpRes = httpWriter.Result()
+
+		resp, _ = io.ReadAll(httpRes.Body)
+
+		gotResp.Reset()
+		json.Indent(&gotResp, resp, ``, `  `)
+		test.Assert(t, c.desc, c.expResp, gotResp.String())
+	}
+}
+
 func TestHttpServer_Encrypt(t *testing.T) {
 	type testCase struct {
 		desc    string
diff --git a/internal/memfs_wui.go b/internal/memfs_wui.go
index d071201..8e7e6e3 100644
--- a/internal/memfs_wui.go
+++ b/internal/memfs_wui.go
@@ -223,7 +223,7 @@ func generate__wui_main_js() *memfs.Node {
 		Content:     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 	}
 	node.SetMode(420)
-	node.SetModTimeUnix(1699984680, 547883778)
+	node.SetModTimeUnix(1699984937, 818808569)
 	node.SetName("main.js")
 	node.SetSize(28870)
 	return node
diff --git a/testdata/http_server/decrypt_test.data b/testdata/http_server/decrypt_test.data
new file mode 100644
index 0000000..fce0b18
--- /dev/null
+++ b/testdata/http_server/decrypt_test.data
@@ -0,0 +1,40 @@
+Testing HTTP API for Decrypt.
+
+>>> withValidRequest/body
+{"path_vault":"/plain.txt.vault"}
+
+<<< withValidRequest/Response/body
+{
+  "data": {
+    "path": "/plain.txt",
+    "path_vault": "/plain.txt.vault"
+  },
+  "code": 200
+}
+
+>>> withEmptyValue/body
+{"path_vault":""}
+
+<<< withEmptyValue/Response/body
+{
+  "message": "Decrypt: empty path_vault",
+  "code": 400
+}
+
+>>> withDirectory/body
+{"path_vault":"/.ssh"}
+
+<<< withDirectory/Response/body
+{
+  "message": "Decrypt: \"/.ssh\" is a directory",
+  "code": 400
+}
+
+>>> withFileNotExist/body
+{"path_vault":"/thisisnotexist"}
+
+<<< withFileNotExist/Response/body
+{
+  "message": "Decrypt \"/thisisnotexist\": file does not exist",
+  "code": 400
+}