从 nodeJS 读取 PDF 文档属性
Read PDF Document properties from nodeJS
我正在尝试从 nodeJS 读取 PDF 文档属性。我找不到任何用于读取文档属性的节点模块。我可以使用 file-metadata but its only giving basic properties. I want to read the properties like Document restriction summary(please check attached image for reference.
读取文件元数据
您是否考虑过使用 exiftool?您必须将它集成到 nodejs 中,但 afaics 它或多或少地提供了您正在寻找的所有数据。
受@DietrichvonSeggern 的启发我写了小节点脚本。
const { spawnSync } = require('child_process');
const { stdout } = spawnSync('exiftool',
['-b', '-UserAccess', 'test.pdf'],
{ encoding: 'ascii' });
const bits = (parseInt(stdout, 10) || 0b111111111110);
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'Fill forms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'Print high-res': 1 << 11
};
Object.keys(perms).forEach((title) => {
const bit = perms[title];
const yesno = (bits & bit) ? 'YES' : 'NO';
console.log(`${title} => ${yesno}`);
});
它将打印如下内容:
Print => YES
Modify => NO
Copy => NO
Annotate => NO
Fill forms => NO
Extract => NO
Assemble => NO
Print high-res => YES
您应该在系统中安装 exiftool
,并向该脚本添加必要的错误检查。
ExifTool UserAccess
tag reference.
稍作修改:
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'FillForms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'PrintHighRes': 1 << 11
};
const access = {};
Object.keys(perms).forEach((perm) => {
const bit = perms[perm];
access[perm] = !!(bits & bit);
});
console.log(access);
将产生:
{
Print: true,
Modify: false,
Copy: false,
Annotate: false,
FillForms: false,
Extract: false,
Assemble: false,
PrintHighRes: true
}
我正在尝试从 nodeJS 读取 PDF 文档属性。我找不到任何用于读取文档属性的节点模块。我可以使用 file-metadata but its only giving basic properties. I want to read the properties like Document restriction summary(please check attached image for reference.
您是否考虑过使用 exiftool?您必须将它集成到 nodejs 中,但 afaics 它或多或少地提供了您正在寻找的所有数据。
受@DietrichvonSeggern 的启发
const { spawnSync } = require('child_process');
const { stdout } = spawnSync('exiftool',
['-b', '-UserAccess', 'test.pdf'],
{ encoding: 'ascii' });
const bits = (parseInt(stdout, 10) || 0b111111111110);
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'Fill forms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'Print high-res': 1 << 11
};
Object.keys(perms).forEach((title) => {
const bit = perms[title];
const yesno = (bits & bit) ? 'YES' : 'NO';
console.log(`${title} => ${yesno}`);
});
它将打印如下内容:
Print => YES
Modify => NO
Copy => NO
Annotate => NO
Fill forms => NO
Extract => NO
Assemble => NO
Print high-res => YES
您应该在系统中安装 exiftool
,并向该脚本添加必要的错误检查。
ExifTool UserAccess
tag reference.
稍作修改:
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'FillForms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'PrintHighRes': 1 << 11
};
const access = {};
Object.keys(perms).forEach((perm) => {
const bit = perms[perm];
access[perm] = !!(bits & bit);
});
console.log(access);
将产生:
{
Print: true,
Modify: false,
Copy: false,
Annotate: false,
FillForms: false,
Extract: false,
Assemble: false,
PrintHighRes: true
}