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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.httpd.raw;

import static com.google.gerrit.server.project.ProjectCache.illegalState;

import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.Url;
import com.google.gerrit.server.PatchSetUtil;
import com.google.gerrit.server.edit.ChangeEdit;
import com.google.gerrit.server.edit.ChangeEditUtil;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.permissions.ChangePermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.project.ProjectCache;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Optional;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.lib.ObjectId;

/**
 * Exports a single version of a patch as a normal file download.
 *
 * 

This can be relatively unsafe with Microsoft Internet Explorer 6.0 as the browser will (rather * incorrectly) treat an HTML or JavaScript file its supposed to download as though it was served by * this site, and will execute it with the site's own protection domain. This opens a massive * security hole so we package the content into a zip file. */ @Singleton public class CatServlet extends HttpServlet { private static final long serialVersionUID = 1L; private final ChangeEditUtil changeEditUtil; private final PatchSetUtil psUtil; private final ChangeNotes.Factory changeNotesFactory; private final PermissionBackend permissionBackend; private final ProjectCache projectCache; @Inject CatServlet( ChangeEditUtil ceu, PatchSetUtil psu, ChangeNotes.Factory cnf, PermissionBackend pb, ProjectCache pc) { changeEditUtil = ceu; psUtil = psu; changeNotesFactory = cnf; permissionBackend = pb; projectCache = pc; } @Override protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException { String keyStr = req.getPathInfo(); // We shouldn't have to do this extra decode pass, but somehow we // are now receiving our "^1" suffix as "%5E1", which confuses us // downstream. Other times we get our embedded "," as "%2C", which // is equally bad. And yet when these happen a "%2F" is left as-is, // rather than escaped as "%252F", which makes me feel really really // uncomfortable with a blind decode right here. // keyStr = Url.decode(keyStr); if (!keyStr.startsWith("/")) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } keyStr = keyStr.substring(1); final Patch.Key patchKey; final int side; { final int c = keyStr.lastIndexOf('^'); if (c == 0) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } if (c < 0) { side = 0; } else { try { side = Integer.parseInt(keyStr.substring(c + 1)); keyStr = keyStr.substring(0, c); } catch (NumberFormatException e) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } } try { patchKey = Patch.Key.parse(keyStr); } catch (NumberFormatException e) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } } final Change.Id changeId = patchKey.patchSetId().changeId(); String revision; try { ChangeNotes notes = changeNotesFactory.createCheckedUsingIndexLookup(changeId); permissionBackend.currentUser().change(notes).check(ChangePermission.READ); projectCache .get(notes.getProjectName()) .orElseThrow(illegalState(notes.getProjectName())) .checkStatePermitsRead(); if (patchKey.patchSetId().get() == 0) { // change edit Optional edit = changeEditUtil.byChange(notes); if (edit.isPresent()) { revision = ObjectId.toString(edit.get().getEditCommit()); } else { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } } else { PatchSet patchSet = psUtil.get(notes, patchKey.patchSetId()); if (patchSet == null) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } revision = patchSet.commitId().name(); } } catch (ResourceConflictException | NoSuchChangeException | AuthException e) { rsp.sendError(HttpServletResponse.SC_NOT_FOUND); return; } catch (PermissionBackendException | IOException e) { getServletContext().log("Cannot query database", e); rsp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); return; } String path = patchKey.fileName(); String restUrl = String.format( "%s/changes/%d/revisions/%s/files/%s/download?parent=%d", req.getContextPath(), changeId.get(), revision, Url.encode(path), side); rsp.sendRedirect(restUrl); } }





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