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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/modules/storage/services/pdf_processor.ex
defmodule PhoenixKit.Modules.Storage.PdfProcessor do
@moduledoc """
Poppler-based PDF processing module.
Handles PDF operations using poppler-utils command-line tools:
- `pdftoppm` - Convert PDF pages to images (JPEG)
- `pdfinfo` - Extract PDF metadata (page count, author, title)
## Dependencies
Requires `poppler-utils` to be installed:
- Debian/Ubuntu: `apt-get install poppler-utils`
- macOS: `brew install poppler`
"""
require Logger
@doc """
Convert the first page of a PDF to a JPEG image.
Uses `pdftoppm` to render the first page at the specified DPI.
## Parameters
- `pdf_path` - Path to the input PDF file
- `output_prefix` - Prefix for the output JPEG file (e.g., "/tmp/my_pdf")
- `opts` - Options
- `:dpi` - Resolution in DPI (default: 150)
## Returns
- `{:ok, jpeg_path}` - Path to the generated JPEG file
- `{:error, reason}` - If conversion fails
"""
def first_page_to_jpeg(pdf_path, output_prefix, opts \\ []) do
dpi = Keyword.get(opts, :dpi, 150)
args = [
"-jpeg",
"-f",
"1",
"-l",
"1",
"-r",
Integer.to_string(dpi),
pdf_path,
output_prefix
]
case System.cmd("pdftoppm", args, stderr_to_stdout: true) do
{_output, 0} ->
# pdftoppm appends page number suffix (e.g., "-1.jpg" or "-01.jpg")
case Path.wildcard("#{output_prefix}*.jpg") do
[jpeg_path | _] ->
{:ok, jpeg_path}
[] ->
{:error, "pdftoppm produced no output files"}
end
{output, exit_code} ->
{:error, "pdftoppm failed (exit #{exit_code}): #{String.trim(output)}"}
end
rescue
e in ErlangError ->
if e.reason == :enoent do
{:error, :poppler_not_installed}
else
{:error, "pdftoppm error: #{inspect(e.reason)}"}
end
end
@doc """
Extract metadata from a PDF file using `pdfinfo`.
## Parameters
- `pdf_path` - Path to the PDF file
## Returns
- `{:ok, metadata}` - Map with extracted metadata
- `{:ok, %{}}` - Empty map on failure (graceful degradation)
"""
def extract_metadata(pdf_path) do
case System.cmd("pdfinfo", [pdf_path], stderr_to_stdout: true) do
{output, 0} ->
metadata = parse_pdfinfo_output(output)
{:ok, metadata}
{_output, _exit_code} ->
Logger.warning("PdfProcessor: pdfinfo failed for #{pdf_path}")
{:ok, %{}}
end
rescue
e in ErlangError ->
if e.reason == :enoent do
Logger.warning("PdfProcessor: pdfinfo not installed")
else
Logger.warning("PdfProcessor: pdfinfo error: #{inspect(e.reason)}")
end
{:ok, %{}}
end
@field_mapping %{
"Pages" => "page_count",
"Title" => "title",
"Author" => "author",
"Creator" => "creator",
"CreationDate" => "creation_date"
}
defp parse_pdfinfo_output(output) do
output
|> String.split("\n")
|> Enum.reduce(%{}, fn line, acc ->
case String.split(line, ":", parts: 2) do
[key, value] ->
parse_pdfinfo_field(String.trim(key), String.trim(value), acc)
_ ->
acc
end
end)
end
defp parse_pdfinfo_field(key, value, acc) do
case Map.get(@field_mapping, key) do
nil -> acc
"page_count" -> parse_page_count(value, acc)
mapped_key when value != "" -> Map.put(acc, mapped_key, value)
_mapped_key -> acc
end
end
defp parse_page_count(value, acc) do
case Integer.parse(value) do
{count, _} -> Map.put(acc, "page_count", count)
:error -> acc
end
end
end