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iframedefaultsize.go
80 lines (69 loc) · 2.14 KB
/
iframedefaultsize.go
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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 iframedefaultsize
import (
"fmt"
"strconv"
"github.com/gauntface/go-html-asset-manager/v3/manipulations"
"github.com/gauntface/go-html-asset-manager/v3/utils/html/htmlparsing"
"golang.org/x/net/html"
)
const (
defaultWidth int64 = 4
defaultHeight int64 = 3
)
func Manipulator(runtime manipulations.Runtime, doc *html.Node) error {
allElements := htmlparsing.FindNodesByTag("iframe", doc)
for _, ele := range allElements {
// Create a map of the iframes attributes
attributes := map[string]html.Attribute{}
for _, a := range ele.Attr {
attributes[a.Key] = a
}
// Check that the iframe has a width and height attribute
width, height := widthAndHeight(attributes)
// Update / set the width and height attributes to the element
attributes["width"] = html.Attribute{
Key: "width",
Val: fmt.Sprintf("%v", width),
}
attributes["height"] = html.Attribute{
Key: "height",
Val: fmt.Sprintf("%v", height),
}
ele.Attr = htmlparsing.AttributesList(attributes)
}
return nil
}
func widthAndHeight(attributes map[string]html.Attribute) (int64, int64) {
widthAttribute, ok := attributes["width"]
if !ok {
return defaultWidth, defaultHeight
}
heightAttribute, ok := attributes["height"]
if !ok {
return defaultWidth, defaultHeight
}
// Parse the width and height attributes
width, err := strconv.ParseInt(widthAttribute.Val, 10, 64)
if err != nil {
return defaultWidth, defaultHeight
}
height, err := strconv.ParseInt(heightAttribute.Val, 10, 64)
if err != nil {
return defaultWidth, defaultHeight
}
return width, height
}