Rename mc --> cmd

cmd/cp-url-syntax.go

@@ -0,0 +1,152 @@
+/*
+ * Minio Client (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/minio/cli"
+)
+
+func checkCopySyntax(ctx *cli.Context) {
+	if len(ctx.Args()) < 2 {
+		cli.ShowCommandHelpAndExit(ctx, "cp", 1) // last argument is exit code.
+	}
+
+	// extract URLs.
+	URLs := ctx.Args()
+	if len(URLs) < 2 {
+		fatalIf(errDummy().Trace(ctx.Args()...), fmt.Sprintf("Unable to parse source and target arguments."))
+	}
+
+	srcURLs := URLs[:len(URLs)-1]
+	tgtURL := URLs[len(URLs)-1]
+	isRecursive := ctx.Bool("recursive")
+
+	/****** Generic Invalid Rules *******/
+	// Verify if source(s) exists.
+	for _, srcURL := range srcURLs {
+		_, _, err := url2Stat(srcURL)
+		if err != nil {
+			fatalIf(err.Trace(srcURL), fmt.Sprintf("Unable to stat '%s'.", srcURL))
+		}
+	}
+
+	// Check if bucket name is passed for URL type arguments.
+	url := newClientURL(tgtURL)
+	if url.Host != "" {
+		// This check is for type URL.
+		if !isURLVirtualHostStyle(url.Host) {
+			if url.Path == string(url.Separator) {
+				fatalIf(errInvalidArgument().Trace(), fmt.Sprintf("Target ‘%s’ does not contain bucket name.", tgtURL))
+			}
+		}
+	}
+
+	// Guess CopyURLsType based on source and target URLs.
+	copyURLsType, err := guessCopyURLType(srcURLs, tgtURL, isRecursive)
+	if err != nil {
+		fatalIf(errInvalidArgument().Trace(), "Unable to guess the type of copy operation.")
+	}
+	switch copyURLsType {
+	case copyURLsTypeA: // File -> File.
+		checkCopySyntaxTypeA(srcURLs, tgtURL)
+	case copyURLsTypeB: // File -> Folder.
+		checkCopySyntaxTypeB(srcURLs, tgtURL)
+	case copyURLsTypeC: // Folder... -> Folder.
+		checkCopySyntaxTypeC(srcURLs, tgtURL, isRecursive)
+	case copyURLsTypeD: // File1...FileN -> Folder.
+		checkCopySyntaxTypeD(srcURLs, tgtURL)
+	default:
+		fatalIf(errInvalidArgument().Trace(), "Unable to guess the type of copy operation.")
+	}
+}
+
+// checkCopySyntaxTypeA verifies if the source and target are valid file arguments.
+func checkCopySyntaxTypeA(srcURLs []string, tgtURL string) {
+	// Check source.
+	if len(srcURLs) != 1 {
+		fatalIf(errInvalidArgument().Trace(), "Invalid number of source arguments.")
+	}
+	srcURL := srcURLs[0]
+	_, srcContent, err := url2Stat(srcURL)
+	fatalIf(err.Trace(srcURL), "Unable to stat source ‘"+srcURL+"’.")
+
+	if !srcContent.Type.IsRegular() {
+		fatalIf(errInvalidArgument().Trace(), "Source ‘"+srcURL+"’ is not a file.")
+	}
+}
+
+// checkCopySyntaxTypeB verifies if the source is a valid file and target is a valid folder.
+func checkCopySyntaxTypeB(srcURLs []string, tgtURL string) {
+	// Check source.
+	if len(srcURLs) != 1 {
+		fatalIf(errInvalidArgument().Trace(), "Invalid number of source arguments.")
+	}
+	srcURL := srcURLs[0]
+	_, srcContent, err := url2Stat(srcURL)
+	fatalIf(err.Trace(srcURL), "Unable to stat source ‘"+srcURL+"’.")
+
+	if !srcContent.Type.IsRegular() {
+		fatalIf(errInvalidArgument().Trace(srcURL), "Source ‘"+srcURL+"’ is not a file.")
+	}
+
+	// Check target.
+	if _, tgtContent, err := url2Stat(tgtURL); err == nil {
+		if !tgtContent.Type.IsDir() {
+			fatalIf(errInvalidArgument().Trace(tgtURL), "Target ‘"+tgtURL+"’ is not a folder.")
+		}
+	}
+}
+
+// checkCopySyntaxTypeC verifies if the source is a valid recursive dir and target is a valid folder.
+func checkCopySyntaxTypeC(srcURLs []string, tgtURL string, isRecursive bool) {
+	// Check source.
+	if len(srcURLs) != 1 {
+		fatalIf(errInvalidArgument().Trace(), "Invalid number of source arguments.")
+	}
+
+	srcURL := srcURLs[0]
+	_, srcContent, err := url2Stat(srcURL)
+	// incomplete uploads are not necessary for copy operation, no need to verify for them.
+	isIncomplete := false
+	if err != nil && !isURLPrefixExists(srcURL, isIncomplete) {
+		fatalIf(err.Trace(srcURL), "Unable to stat source ‘"+srcURL+"’.")
+	}
+
+	if srcContent.Type.IsDir() && !isRecursive {
+		fatalIf(errInvalidArgument().Trace(srcURL), "To copy a folder requires --recursive option.")
+	}
+
+	// Check target.
+	if _, tgtContent, err := url2Stat(tgtURL); err == nil {
+		if !tgtContent.Type.IsDir() {
+			fatalIf(errInvalidArgument().Trace(tgtURL), "Target ‘"+tgtURL+"’ is not a folder.")
+		}
+	}
+}
+
+// checkCopySyntaxTypeD verifies if the source is a valid list of files and target is a valid folder.
+func checkCopySyntaxTypeD(srcURLs []string, tgtURL string) {
+	// Source can be anything: file, dir, dir...
+	// Check target if it is a dir
+	if _, tgtContent, err := url2Stat(tgtURL); err == nil {
+		if !tgtContent.Type.IsDir() {
+			fatalIf(errInvalidArgument().Trace(tgtURL), "Target ‘"+tgtURL+"’ is not a folder.")
+		}
+	}
+}