node.js Gmail API：获取嵌入式/嵌入式图像 [英] node.js Gmail API: Getting Inline/Embedded images
本文介绍了node.js Gmail API：获取嵌入式/嵌入式图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
抓取电子邮件时，我运行 gmail.users.messages.get（），然后运行以下两个函数来处理有效内容。
function getBody（message）{
var encodedBody ='';
尝试{
if（typeof message.parts ==='undefined'）{
encodedBody = message.body.data;
}
else {
encodedBody = getHTMLPart（message.parts）;
}
encodedBody = encodedBody.replace（/ - / g，'+'）。replace（/ _ / g，'/'）.replace（/\s/g，''）;
}
catch（e）{} //出现故障
return decodeURIComponent（escape（window.atob（encodedBody）））;
}
函数getHTMLPart（arr）{
for（var x = 0; x <= arr.length; x ++）{
if（typeof arr [ x] .parts ==='undefined'）{
if（arr [x] .mimeType ==='text / html'）{
return arr [x] .body.data;
}
}
else {
return getHTMLPart（arr [x] .parts）;
}
}
return'';
}
然后将这些数据保存到.html文件中供以后使用。问题在于内联图像没有嵌入base64或其他方式来检索数据，而是使用唯一的CID进行嵌入。
所以我需要做的是，当从上述函数中检索有效载荷时，我需要检索嵌入的图像并将其保存在本地， \CID.png> （或JPG或其他）。然后，我可以对邮件进行替换，将HTML中嵌入的CID替换为图片的本地路径。
所以，有谁知道如何或有任何建议如何获得这些嵌入式图像？提前致谢！解决方案
图像将被提取到附件中。查找包含 Content-ID 或 X中的标题，获取附件，然后插入base64数据作为图像源，而不是 cid 的响应部分-Attachment-Id cid 。
示例
var response = {id：15ade50437b9aa01，threadId：15ade50437b9aa01，labelIds：[UNREAD，IMPORTANT，SENT，INBOX]，snippet： ，historyId：1171380，internalDate：1489788486000，payload：{mimeType：multipart / related，filename：，headers：[{name：内容类型，值：multipart / related; boundary = 94eb2c034184892a95054af46913}]，body：{size：0}，parts：[{mimeType：multipart / alternative文件名：，标题：[ {name：Content-Type，value：multipart / alternative; border = 94eb2c034184892a93054af46912}]，body：{size：0}，parts：[{partId：0.0，mimeType：text / plain headers：[{name：Content-Type，value：text / plain; charset = UTF-8}]，body：{size：25，data：W2ltYWdlOiBJbmZvZ2FkIGJpbGQgMV0NCg ==}}，{partId：0.1，mimeType：text / html ，filename：，headers：[{name：Content-Type，value：text / html;字符集= UTF-8\" }]， 体：{ 大小：106， 数据： PGRpdiBkaXI9Imx0ciI-PGltZyBzcmM9ImNpZDppaV8xNWFkZTUwMmVlYTg0MGNlIiBhbHQ9IkluZm9nYWQgYmlsZCAxIiB3aWR0aD0iNTgiIGhlaWdodD0iNTQiPjxicj48L2Rpdj4NCg ==}}]}，{ PARTID： 1， mime类型： image / png，filename：smile.png，headers：[{name：Content-Type，value：image / png; name = \smile.png \}，{name：Content-Disposition，value：inline;文件名= \smile.png \}}，{name：Content-Transfer-Encoding，value：base64}，{name：Content-ID ： \\\}，{ 名称： X-附件-ID， 值： ii_15ade502eea840ce}]中， 身体：{ 附件ID：ANGjdJ8Xh1_0DBjFbc2qKRHD8uTw-9nkPP30v-vohJforDg54EHPHf3Obd2P9W6Wfss0cwfmblQWi5F3958vcEi0HyiMNgpKJbsQAVP9viUOY4LzyxwAvR7- dis4PNGflBpkZFMHv62LGKkQ1-ZPG3Go_Xh_sXJUveHl4JjmwLpNp6LjlHzuA_3XOkY2LLQLFmXNTo_dJbqDQWvMb8UTGnATMOoTNKvNQ4Ndr9pgQYI1SBvtdThgUDmlOGKYLHM6qR4AlrNNFnPUCZZU-BB7o7Dt2dhj-kexiIdvaB2LEnoeCBth_oK9HELt2tw4rlY， 大小：8539}}]}， sizeEstimate：12800};功能getHtml（RES）{风险份= [res.payload];而（parts.length）{风险部分= parts.shift（）; if（part.parts）{parts = parts.concat（part.parts）;} if（part.mimeType ==='text / html'）{return decodeURIComponent（escape（atob（part。 body.data.replace（/ \ - / g，'+'）。replace（/ \_ / g，'/'））））; }} return'';} function getAttachmentId（res，cid）{var parts = [res.payload]; while（parts.length）{var part = parts.shift（）; if（part.parts）{parts = parts.concat（part.parts）; } var headers = part.headers; var indexedHeaders = headers.reduce（function（acc，header）{acc [header.name.toLowerCase（）] = header.value; return acc;}，{}）; var contentId = indexedHeaders ['content-id'] || ; var xAttachmentId = indexedHeaders ['x-attachment-id'] || ; if（contentId.includes（cid）|| xAttachmentId.includes（cid））{return part.body.attachmentId; }} return'';} var html = getHtml（response）; console.log（html）; //提取cids并在responsevar中找到匹配的附件attachmentId = getAttachmentId（response，'ii_15ade502eea840ce'）; console.log attachmentId）; //从Gmail API获取附件，并将cid替换为base64-data
When grabbing an email I run the gmail.users.messages.get() and then run the following two functions to process the payload.
function getBody(message) {
var encodedBody = '';
try{
if(typeof message.parts === 'undefined'){
encodedBody = message.body.data;
}
else{
encodedBody = getHTMLPart(message.parts);
}
encodedBody = encodedBody.replace(/-/g, '+').replace(/_/g, '/').replace(/\s/g, '');
}
catch(e) {} // there was a failure
return decodeURIComponent(escape(window.atob(encodedBody)));
}
function getHTMLPart(arr) {
for(var x = 0; x <= arr.length; x++){
if(typeof arr[x].parts === 'undefined'){
if(arr[x].mimeType === 'text/html'){
return arr[x].body.data;
}
}
else{
return getHTMLPart(arr[x].parts);
}
}
return '';
}
I then save that data into an .html file for later use. The problem is that inline images aren't embedded with base64 or any other way to retrieve that data, but are instead embedded using a unique CID.
So what I need to do is, when retrieving the payload from the above function, I need to also retrieve the embedded image and save it locally as <\CID.png> (or jpg or whatever). I can then to a replace on the message to replace the CID embed in the html with the local path of the image.
So does anyone know how or have any advice on how to get those embedded images? Thanks in advance!
解决方案
The images will be extracted into attachments. Look for the part in the response that includes the cid in the Content-ID or X-Attachment-Id headers, get the attachment, and insert the base64 data as the image source instead of the cid.
Example
var response = {
"id": "15ade50437b9aa01",
"threadId": "15ade50437b9aa01",
"labelIds": [
"UNREAD",
"IMPORTANT",
"SENT",
"INBOX"
],
"snippet": "",
"historyId": "1171380",
"internalDate": "1489788486000",
"payload": {
"mimeType": "multipart/related",
"filename": "",
"headers": [
{
"name": "Content-Type",
"value": "multipart/related; boundary=94eb2c034184892a95054af46913"
}
],
"body": {
"size": 0
},
"parts": [
{
"mimeType": "multipart/alternative",
"filename": "",
"headers": [
{
"name": "Content-Type",
"value": "multipart/alternative; boundary=94eb2c034184892a93054af46912"
}
],
"body": {
"size": 0
},
"parts": [
{
"partId": "0.0",
"mimeType": "text/plain",
"filename": "",
"headers": [
{
"name": "Content-Type",
"value": "text/plain; charset=UTF-8"
}
],
"body": {
"size": 25,
"data": "W2ltYWdlOiBJbmZvZ2FkIGJpbGQgMV0NCg=="
}
},
{
"partId": "0.1",
"mimeType": "text/html",
"filename": "",
"headers": [
{
"name": "Content-Type",
"value": "text/html; charset=UTF-8"
}
],
"body": {
"size": 106,
"data": "PGRpdiBkaXI9Imx0ciI-PGltZyBzcmM9ImNpZDppaV8xNWFkZTUwMmVlYTg0MGNlIiBhbHQ9IkluZm9nYWQgYmlsZCAxIiB3aWR0aD0iNTgiIGhlaWdodD0iNTQiPjxicj48L2Rpdj4NCg=="
}
}
]
},
{
"partId": "1",
"mimeType": "image/png",
"filename": "smile.png",
"headers": [
{
"name": "Content-Type",
"value": "image/png; name=\"smile.png\""
},
{
"name": "Content-Disposition",
"value": "inline; filename=\"smile.png\""
},
{
"name": "Content-Transfer-Encoding",
"value": "base64"
},
{
"name": "Content-ID",
"value": "\u003cii_15ade502eea840ce\u003e"
},
{
"name": "X-Attachment-Id",
"value": "ii_15ade502eea840ce"
}
],
"body": {
"attachmentId": "ANGjdJ8Xh1_0DBjFbc2qKRHD8uTw-9nkPP30v-vohJforDg54EHPHf3Obd2P9W6Wfss0cwfmblQWi5F3958vcEi0HyiMNgpKJbsQAVP9viUOY4LzyxwAvR7-dis4PNGflBpkZFMHv62LGKkQ1-ZPG3Go_Xh_sXJUveHl4JjmwLpNp6LjlHzuA_3XOkY2LLQLFmXNTo_dJbqDQWvMb8UTGnATMOoTNKvNQ4Ndr9pgQYI1SBvtdThgUDmlOGKYLHM6qR4AlrNNFnPUCZZU-BB7o7Dt2dhj-kexiIdvaB2LEnoeCBth_oK9HELt2tw4rlY",
"size": 8539
}
}
]
},
"sizeEstimate": 12800
};
function getHtml(res) {
var parts = [res.payload];
while (parts.length) {
var part = parts.shift();
if (part.parts) {
parts = parts.concat(part.parts);
}
if(part.mimeType === 'text/html') {
return decodeURIComponent(escape(atob(part.body.data.replace(/\-/g, '+').replace(/\_/g, '/'))));
}
}
return '';
}
function getAttachmentId(res, cid) {
var parts = [res.payload];
while (parts.length) {
var part = parts.shift();
if (part.parts) {
parts = parts.concat(part.parts);
}
var headers = part.headers;
var indexedHeaders = headers.reduce(function(acc, header) {
acc[header.name.toLowerCase()] = header.value;
return acc;
}, {});
var contentId = indexedHeaders['content-id'] || '';
var xAttachmentId = indexedHeaders['x-attachment-id'] || '';
if (contentId.includes(cid) || xAttachmentId.includes(cid)) {
return part.body.attachmentId;
}
}
return '';
}
var html = getHtml(response);
console.log(html);
// Extract the cids and find the matching attachments in the response
var attachmentId = getAttachmentId(response, 'ii_15ade502eea840ce');
console.log(attachmentId);
// Get the attachment from the Gmail API and replace the cid
// with the base64-data
这篇关于node.js Gmail API：获取嵌入式/嵌入式图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
