AWS Lambda测试失败：XML解析错误排查求助

多次执行AWS Lambda测试均失败，出现XML解析错误，已仔细检查代码及API端点仍未找到解决办法。现附上错误信息与源码，恳请具备XML数据处理经验的人士提供解决方案。

错误信息 #

{
  "errorType": "Error",
  "errorMessage": "Input buffer has corrupt header: glib: XML parse error: Error domain 1 code 5 on line 24 column 15 of data: Extra content at the end of the document",
  "trace": [
    "Error: Input buffer has corrupt header: glib: XML parse error: Error domain 1 code 5 on line 24 column 15 of data: Extra content at the end of the document"
  ]
}

源码 #

// AWS packages
const AWS = require("aws-sdk");
const docClient = new AWS.DynamoDB.DocumentClient();

// Image processing packages
const sharp = require("sharp");
const fetch = require("node-fetch");
const path = require("path");
const fs = require("fs");

// Function to update the DynomoDb table
async function updateDynomoDBObject() {
  const quoteTableName = process.env.API_QUOTEGEN_QUOTEAPPTESTTABLE_NAME;
  const quoteObejectID = "Object ID goes here";

  try {
    var quoteParams = {
      TableName: quoteTableName,
      Key: {
        id: quoteObejectID,
      },
      UpdateExpression: "SET #quotesGenerated = #quotesGenerated + :inc",
      ExpressionAttributeValues: {
        ":inc": 1,
      },
      ExpressionAtributeNames: {
        "#quotesGenerated": "quotesGenerated",
      },
      ReturnValues: "UPDATED_NEW",
    };
    const updateQuoteObject = await docClient.update(quoteParams).promise();
    return updateQuoteObject;
  } catch (error) {
    console.log(
      "Error is catched in updating the quote object in DynomoDB",
      error
    );
  }
}

exports.handler = async (event) => {
  console.log(`EVENT: ${JSON.stringify(event)}`);

  const apiURL = "https://zenquotes.io/api/random";

  // Generate a quote image using sharp

  async function getRandomQuote(apiURLInput) {
    // my quote is ..
    let quoteText;
    // author name here
    let quoteAuthor;

    // validate response to the api
    const response = await fetch(apiURLInput);
    var quoteData = await response.json();
    console.log(quoteData);

    // quote elements
    quoteText = quoteData[0].q;
    quoteAuthor = quoteData[0].a;

    // image construction
    const width = 750;
    const height = 483;
    const text = quoteText;
    const words = text.split(" ");
    const lineBreak = 4;
    let newText = "";

    // define some tspan elements 4 words each
    let tspanElements = "";
    for (let i = 0; i < words.length; i++) {
      newText += words[i] + " ";
      if ((i + 1) % lineBreak === 0) {
        tspanElements += `<tspan x="${
          width / 2
        }" dy="1.2em">${newText}</tspan>`;
        newText = "";
      }
    }
    if (newText !== "") {
      tspanElements += `<tspan x="${width / 2}" dy="1.2em">${newText}</tspan>`;
    }
    console.log(tspanElements);

    // construct SVG
    const svgImg = `
      <svg width="${width}" height="${height}">
          <style>
            .title {
                fill: #ffffff;
                font-size: 20px;
                font-weight: bold;
            }     
            .quoteAuthorStyles {
                font-size: 35px;
                font-weight: bold;
                padding: 50px;
            }
            .footerStyles {
                font-size: 20px;
                font-weight: bold;
                fill: lightgrey;
                text-anchor: middle;
                font-family: Verdana;
            }
            </style>
            <circle cx="382" cy="76" r="44" fill="rgba(255, 255, 255, 0.155)"/>
            <text x="382" y="76" dy="50" text-anchor="middle" font-size="90" font-family="Verdana" fill=""white">"</text>
            <g>
                <rect x="0" y="0" width="${width}" height="auto"></rect>
                <text id="lastLineOfQuote" x="375" y="120" font-family="Verdana" font-size="35" fill="white" text-anchor="middle"> 
                    <tspan x="${width / 2}" dy="1.2em">${tspanElements}</tspan>
                    <tspan class="quoteAuthorStyles" x="375" dy="1.8em">-${quoteAuthor}</tspan>          
                </text>
            </g>
            <text x="${width / 2}" y="${
      height - 10
    }" class="footerStyles"> Developed by @Sardor-M | Quotes from ZenQuotes.io</text>
    </svg>
    `;

    // add background images for the svg creation
    const backgroundImages = [
      "backgrounds/Delhi.png",
      "backgrounds/DeepSea.png",
      "backgrounds/Dusk.png",
      "backgrounds/Sun.png",
    ];

    const randomIndex = Math.floor(Math.random() * backgroundImages.length);
    const selectedBackgoundImage = backgroundImages[randomIndex];

    // Composite this image together
    const timestamp = new Date().toLocaleDateString().replace(/[^\d]/g, "");
    const svgBuffer = Buffer.from(svgImg);

    const imagePath = path.join("/tmp", "quote-card.png");
    const image = await sharp(selectedBackgoundImage)
      .composite([
        {
          input: svgBuffer,
          top: 0,
          left: 0,
        },
      ])
      .toFile(imagePath);

    // function to update the quote object in DynomoDB
    try {
      updateDynomoDBObject();
    } catch (error) {
      console.log("error in updating the quote object in DynomoDB", error);
    }
    return {
      statusCode: 200,
      //  Uncomment below to enable CORS requests
      headers: {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Headers": "*",
      },
      body: fs.readFileSync(imagePath).toString("base64"),
      isBase64Encoded: true,
    };
  }
  return await getRandomQuote(apiURL);
};

已检查API端点及返回响应，但仍未发现问题所在。

内容的提问来源于stack exchange，提问作者Sardor