forked from googleapis/java-storage
/
PostPolicyV4.java
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/
PostPolicyV4.java
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/*
* Copyright 2020 Google LLC
*
* 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.cloud.storage;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
/**
* Presigned V4 post policy.
*
* @see <a href="https://cloud.google.com/storage/docs/xml-api/post-object">POST Object</a>
*/
public final class PostPolicyV4 {
private final String url;
private final Map<String, String> fields;
private PostPolicyV4(String url, Map<String, String> fields) {
this.url = url;
this.fields = fields;
}
public static PostPolicyV4 of(String url, Map<String, String> fields) {
return new PostPolicyV4(url, fields);
}
public String getUrl() {
return url;
}
public Map<String, String> getFields() {
return fields;
}
/**
* Class representing which fields to specify in a V4 POST request.
*
* @see <a href="https://cloud.google.com/storage/docs/xml-api/post-object#form_fields">POST
* Object Form fields</a>
*/
public static final class PostFieldsV4 {
private final Map<String, String> fieldsMap;
private PostFieldsV4(Builder builder) {
this.fieldsMap = builder.fieldsMap;
}
private PostFieldsV4(Map<String, String> fields) {
this.fieldsMap = fields;
}
public static PostFieldsV4 of(Map<String, String> fields) {
return new PostFieldsV4(fields);
}
public static Builder newBuilder() {
return new Builder();
}
public Map<String, String> getFieldsMap() {
return fieldsMap;
}
public static class Builder {
private static final String CUSTOM_FIELD_PREFIX = "x-goog-meta-";
private final Map<String, String> fieldsMap;
private Builder() {
this.fieldsMap = new HashMap<>();
}
public PostFieldsV4 build() {
return new PostFieldsV4(this);
}
public Builder setAcl(String acl) {
fieldsMap.put("acl", acl);
return this;
}
public Builder setCacheControl(String cacheControl) {
fieldsMap.put("cache-control", cacheControl);
return this;
}
public Builder setContentDisposition(String contentDisposition) {
fieldsMap.put("content-disposition", contentDisposition);
return this;
}
public Builder setContentEncoding(String contentEncoding) {
fieldsMap.put("content-encoding", contentEncoding);
return this;
}
public Builder setContentLength(int contentLength) {
fieldsMap.put("content-length", "" + contentLength);
return this;
}
public Builder setContentType(String contentType) {
fieldsMap.put("content-type", contentType);
return this;
}
/** @deprecated use {@link #setExpires(String)} */
@Deprecated
public Builder Expires(String expires) {
return setExpires(expires);
}
public Builder setExpires(String expires) {
fieldsMap.put("expires", expires);
return this;
}
public Builder setSuccessActionRedirect(String successActionRedirect) {
fieldsMap.put("success_action_redirect", successActionRedirect);
return this;
}
public Builder setSuccessActionStatus(int successActionStatus) {
fieldsMap.put("success_action_status", "" + successActionStatus);
return this;
}
/** @deprecated use {@link #addCustomMetadataField(String, String)} */
@Deprecated
public Builder AddCustomMetadataField(String field, String value) {
return addCustomMetadataField(field, value);
}
public Builder addCustomMetadataField(String field, String value) {
if (!field.startsWith(CUSTOM_FIELD_PREFIX)) {
field = CUSTOM_FIELD_PREFIX + value;
}
fieldsMap.put(field, value);
return this;
}
}
}
/**
* Class for specifying conditions in a V4 POST Policy document.
*
* @see <a href="https://cloud.google.com/storage/docs/authentication/signatures#policy-document">
* Policy document</a>
*/
public static final class PostConditionsV4 {
private Set<ConditionV4> conditions;
private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
public PostConditionsV4(Builder builder) {
this.conditions = builder.conditions;
}
public Builder toBuilder() {
return new Builder(conditions);
}
public static Builder newBuilder() {
return new Builder();
}
public Set<ConditionV4> getConditions() {
return conditions;
}
public static class Builder {
Set<ConditionV4> conditions;
private Builder() {
this.conditions = new LinkedHashSet<>();
}
private Builder(Set<ConditionV4> conditions) {
this.conditions = conditions;
}
public static Builder newBuilder() {
return new Builder();
}
public PostConditionsV4 build() {
return new PostConditionsV4(this);
}
public Builder addAclCondition(ConditionV4Type type, String acl) {
conditions.add(new ConditionV4(type, "acl", acl));
return this;
}
public Builder addBucketCondition(ConditionV4Type type, String bucket) {
conditions.add(new ConditionV4(type, "bucket", bucket));
return this;
}
public Builder addCacheControlCondition(ConditionV4Type type, String cacheControl) {
conditions.add(new ConditionV4(type, "cache-control", cacheControl));
return this;
}
public Builder addContentDispositionCondition(
ConditionV4Type type, String contentDisposition) {
conditions.add(new ConditionV4(type, "content-disposition", contentDisposition));
return this;
}
public Builder addContentEncodingCondition(ConditionV4Type type, String contentEncoding) {
conditions.add(new ConditionV4(type, "content-encoding", contentEncoding));
return this;
}
public Builder addContentLengthCondition(ConditionV4Type type, int contentLength) {
conditions.add(new ConditionV4(type, "content-length", "" + contentLength));
return this;
}
public Builder addContentTypeCondition(ConditionV4Type type, String contentType) {
conditions.add(new ConditionV4(type, "content-type", contentType));
return this;
}
public Builder addExpiresCondition(ConditionV4Type type, long expires) {
conditions.add(new ConditionV4(type, "expires", dateFormat.format(expires)));
return this;
}
public Builder addExpiresCondition(ConditionV4Type type, String expires) {
conditions.add(new ConditionV4(type, "expires", expires));
return this;
}
public Builder addKeyCondition(ConditionV4Type type, String key) {
conditions.add(new ConditionV4(type, "key", key));
return this;
}
public Builder addSuccessActionRedirectUrlCondition(
ConditionV4Type type, String successActionRedirectUrl) {
conditions.add(new ConditionV4(type, "success_action_redirect", successActionRedirectUrl));
return this;
}
public Builder addSuccessActionStatusCondition(ConditionV4Type type, int status) {
conditions.add(new ConditionV4(type, "success_action_status", "" + status));
return this;
}
public Builder addContentLengthRangeCondition(int min, int max) {
conditions.add(new ConditionV4(ConditionV4Type.CONTENT_LENGTH_RANGE, "" + min, "" + max));
return this;
}
Builder addCustomCondition(ConditionV4Type type, String field, String value) {
conditions.add(new ConditionV4(type, field, value));
return this;
}
}
}
/**
* Class for a V4 POST Policy document.
*
* @see <a href="https://cloud.google.com/storage/docs/authentication/signatures#policy-document">
* Policy document</a>
*/
public static final class PostPolicyV4Document {
private final String expiration;
private final PostConditionsV4 conditions;
private PostPolicyV4Document(String expiration, PostConditionsV4 conditions) {
this.expiration = expiration;
this.conditions = conditions;
}
public static PostPolicyV4Document of(String expiration, PostConditionsV4 conditions) {
return new PostPolicyV4Document(expiration, conditions);
}
public String toJson() {
JsonObject object = new JsonObject();
JsonArray conditions = new JsonArray();
for (ConditionV4 condition : this.conditions.conditions) {
switch (condition.type) {
case MATCHES:
JsonObject match = new JsonObject();
match.addProperty(condition.operand1, condition.operand2);
conditions.add(match);
break;
case STARTS_WITH:
JsonArray startsWith = new JsonArray();
startsWith.add("starts-with");
startsWith.add("$" + condition.operand1);
startsWith.add(condition.operand2);
conditions.add(startsWith);
break;
case CONTENT_LENGTH_RANGE:
JsonArray contentLengthRange = new JsonArray();
contentLengthRange.add("content-length-range");
contentLengthRange.add(Integer.parseInt(condition.operand1));
contentLengthRange.add(Integer.parseInt(condition.operand2));
conditions.add(contentLengthRange);
break;
}
}
object.add("conditions", conditions);
object.addProperty("expiration", expiration);
String json = object.toString();
StringBuilder escapedJson = new StringBuilder();
// Certain characters in a policy must be escaped
for (char c : json.toCharArray()) {
if (c >= 128) { // is a unicode character
escapedJson.append(String.format("\\u%04x", (int) c));
} else {
switch (c) {
case '\\':
escapedJson.append("\\\\");
break;
case '\b':
escapedJson.append("\\b");
break;
case '\f':
escapedJson.append("\\f");
break;
case '\n':
escapedJson.append("\\n");
break;
case '\r':
escapedJson.append("\\r");
break;
case '\t':
escapedJson.append("\\t");
break;
case '\u000b':
escapedJson.append("\\v");
break;
default:
escapedJson.append(c);
}
}
}
return escapedJson.toString();
}
}
public enum ConditionV4Type {
MATCHES,
STARTS_WITH,
CONTENT_LENGTH_RANGE
}
/**
* Class for a specific POST policy document condition.
*
* @see <a href="https://cloud.google.com/storage/docs/authentication/signatures#policy-document">
* Policy document</a>
*/
static final class ConditionV4 {
final ConditionV4Type type;
final String operand1;
final String operand2;
private ConditionV4(ConditionV4Type type, String operand1, String operand2) {
this.type = type;
this.operand1 = operand1;
this.operand2 = operand2;
}
@Override
public boolean equals(Object other) {
ConditionV4 condition = (ConditionV4) other;
return this.type == condition.type
&& this.operand1.equals(condition.operand1)
&& this.operand2.equals(condition.operand2);
}
@Override
public int hashCode() {
return Objects.hash(type, operand1, operand2);
}
}
}