Paper Full-text Harvest

Pipeline for downloading academic paper full-text at scale. Handles the three classes of sources that exist in 2026:

1. Publisher TDM APIs (Elsevier / Wiley / Springer) — for paywalled content where the institution has a subscription
2. OA aggregators (Unpaywall / OpenAlex / Crossref) — for Open Access copies regardless of publisher
3. Browser fallback (logged-in user profile) — for paywalled publishers without a TDM API (ACS / RSC / IEEE / AIP / IOP / APS / T&F / many CN journals)

The publisher router (auto_paper_download/publishers.py) recognises 25 DOI prefixes across 19 families, each annotated with the right downstream path (TDM client / OA aggregator / browser fallback) and a support tier. The router is shared with the standalone auto-paper-harvester CLI — see SUPPORTED_PUBLISHERS.md there for the full per-publisher table.

Decision tree

Have a DOI list?
├── DOIs from Elsevier (10.1016, 10.1006, 10.1011)
│   └── Use ElsevierClient (TDM XML API)             → §1
├── DOIs from Wiley (10.1002, 10.1111)
│   └── Use WileyClient (TDM PDF API)                → §1
├── DOIs from Springer/Nature (10.1007, 10.1038, 10.1186, 10.1147)
│   ├── OA papers → SpringerClient OA API            → §1
│   └── Subscription papers → fall through to OA/browser
├── Browser-only publishers without TDM API
│   (10.1021 ACS, 10.1039 RSC, 10.1126 Science, 10.1109 IEEE,
│    10.1063 AIP, 10.1088/10.1143 IOP, 10.1103 APS, 10.1146 Annual Reviews,
│    10.1080 T&F, 10.1116 AVS, 10.1149 ECS, 10.1364 Optica, 10.3938 KPS)
│   ├── Try OA first via Unpaywall/OpenAlex          → §2
│   └── Last resort: browser fallback                → §3
├── OA-leaning publishers (10.1073 PNAS, 10.3762 Beilstein)
│   └── OpenAlex/Unpaywall usually works             → §2
└── Mixed list (typical case)
    └── Use the orchestrated CLI (handles all of the above) → §0

§0. Quick start (orchestrated CLI)

For a typical mixed list of DOIs from Web of Science / Scopus export:

# Setup once
cp scripts/.env.example .env
# Edit .env to fill API keys (see §4 "Configuration")

# Run
python -m auto_paper_download \
    --savedrecs your_export.xls \
    --output-dir ./downloads/ \
    --delay 2.0

The CLI:

• Parses DOIs from WoS savedrecs (or pass multiple --savedrecs)
• Routes each DOI to the right client by prefix
• Handles rate limiting + retries
• Per-publisher success summary at end

For resume-safe Elsevier bulk (the most common large run, e.g. 5000+ Elsevier DOIs):

python scripts/redownload_elsevier.py \
    --excel papers.xlsx \
    --output-dir ./elsevier_xml/ \
    --resume \
    --long-pause-every 200 \
    --long-pause-sec 300

§1. Publisher TDM APIs

Read references/tdm-apis.md for full per-publisher details.

Quick reference:

Publisher	API	Auth env var	Output	Rate limit
Elsevier	api.elsevier.com/content/article/doi/{DOI}?view=FULL	ELSEVIER_API_KEY + ELSEVIER_INSTTOKEN	XML (full-text)	~5 req/sec
Wiley	api.wiley.com/onlinelibrary/tdm/v1/articles/{DOI}	WILEY_TDM_TOKEN	PDF	3 req/sec hard cap
Springer (OA)	api.springernature.com/openaccess/json	SPRINGER_API_KEY	JSON+text	1 req/sec free
Crossref TDM	URL from link[] field with intended-application: text-mining	CR_CLICKTHROUGH_TOKEN	varies	varies

Critical: All TDM APIs require institutional IP allowlisting — must run from the institution's network or VPN. Test with one DOI before bulk runs.

Instantiate clients directly:

from auto_paper_download.clients import ElsevierClient, WileyClient

elsevier = ElsevierClient()  # reads env vars
xml_path = elsevier.download_structured_full_text(
    doi="10.1016/j.ces.2025.123003",
    article_dir=Path("downloads/10.1016_j.ces.2025.123003"),
)

wiley = WileyClient()
pdf_path = wiley.download_pdf(
    doi="10.1002/anie.202500001",
    article_dir=Path("downloads/10.1002_anie.202500001"),
)

§2. OA fallback (Unpaywall / OpenAlex / Crossref)

For papers that may have OA copies regardless of publisher.

from auto_paper_download.clients import UnpaywallClient, OpenAlexClient, CrossrefClient

# Unpaywall: best OA PDF URL
up = UnpaywallClient()
pdf_path = up.download_pdf(doi=doi, article_dir=Path("downloads/.."))

# OpenAlex: alternative OA source
oa = OpenAlexClient()
pdf_path = oa.download_pdf(doi=doi, article_dir=Path("downloads/.."))

# Crossref: tries to find publisher PDF link
cr = CrossrefClient()
pdf_path = cr.download_pdf(doi=doi, article_dir=Path("downloads/.."))

Always validate downloaded PDFs: First 4 bytes must be %PDF and file size > 50KB. The clients in this skill do this automatically.

Expected hit rate for OA fallback: 40-60% on a generic chemistry/biology list. Recent papers (>2023) have higher OA rates.

§3. Browser fallback (paywalled, no TDM)

For publishers where API isn't available but the user has institutional Cloudflare/SSO access via browser cookies. Slowest path — only use after exhausting §1–§2.

Two routes — pick one

	Route A: OpenClaw browser tool	Route B: auto-paper-harvester v0.2+ CLI
What	Drive the user's running Chrome via the agent's browser capability with profile="user"	Standalone CLI with built-in Playwright launch_persistent_context
Setup	None — reuses whatever Chrome the user is logged into	pip install 'auto-paper-download[browser]' && playwright install chromium
Cookies	User's existing daily-driver Chrome cookies (zero re-login)	Dedicated isolated profile; user logs into SSO once on first run
Selectors	Per-publisher CSS in references/browser-fallback.md (ACS / Wiley / RSC / T&F / Nature / AIP / CN journals)	Per-family selectors baked into browser_fallback.py (14 publisher families)
Best for	Agent workflows where the user is actively at the keyboard, fewer DOIs (< 100), or one-off rescue runs	Unattended bulk runs (1000+ DOIs), CI/headless servers, when you don't want to lock the user's Chrome
Cost	Ties up user's Chrome for ~5 s/paper	Spawns its own Chromium; user's browser stays free
Surface area	Lives in this skill (references/browser-fallback.md + browser tool)	Lives in the auto-paper-harvester repo (separate install)

Decision rule:

• Default to Route A inside this skill (zero install, leverages session the user already has).
• Recommend Route B when the run is large (> 500 DOIs), runs unattended, or the user's Chrome shouldn't be locked. Both routes feed into the same downstream validation (PDF magic bytes, file size).

Route A details — OpenClaw browser tool

Read references/browser-fallback.md before starting. It covers:

• How to drive the user's logged-in Chrome via OpenClaw browser tool with profile="user"
• Per-publisher CSS selectors for ACS, Wiley, RSC, T&F, Springer, Nature, AIP, and 3 major Chinese journals
• Cloudflare detection + retry strategy
• Single-tab reuse pattern (don't open a new tab per DOI — leaks)
• Kill-switch via /tmp/stop_scrape

Route B details — auto-paper-harvester CLI

# One-time install (separate from this skill)
git clone https://github.com/jxtse/auto-paper-harvester.git
cd auto-paper-harvester
pip install -e '.[browser]' && playwright install chromium

# Run with same DOI file you'd otherwise feed to this skill
python -m auto_paper_download --savedrecs your_export.xls --use-browser-fallback

It routes every DOI through the same publisher TDM → OA → browser chain as this skill, with the browser pass running automatically against any DOI the API pipeline failed. See its README and SKILL.md for full docs.

Hard reality (applies to both routes)

ACS / Wiley / T&F use Cloudflare. Even with a logged-in profile, expect:

• ~30% Cloudflare challenges (retry after 10 s usually clears)
• Some sites detect headless and hard-block — a real Chrome with an active session (Route A) is more robust than fresh Chromium (Route B) in those cases
• Throughput: ~5 sec/paper, ~70-90% success

§4. Configuration

Required env vars (set in .env, see scripts/.env.example):

Variable	Required for	How to get
ELSEVIER_API_KEY	Elsevier	https://dev.elsevier.com/ (free key)
ELSEVIER_INSTTOKEN	Elsevier institutional access	Contact your library
WILEY_TDM_TOKEN	Wiley	https://onlinelibrary.wiley.com/library-info/resources/text-and-datamining (institution must sign TDM agreement)
SPRINGER_API_KEY	Springer OA	https://dev.springernature.com/ (free key)
CROSSREF_MAILTO	Crossref polite pool (recommended)	Just your email
OPENALEX_MAILTO	OpenAlex polite pool (recommended)	Just your email
UNPAYWALL_EMAIL	Unpaywall (required)	Just your email

Notes:

• All env vars are optional — missing ones simply disable that source
• CROSSREF_REQUEST_DELAY / WILEY_REQUEST_DELAY allow tuning per-source delay

Core principles

1. Cache directory structure: each DOI gets its own folder named <safe_doi>/ (with / replaced by _). This makes resume trivial — check if folder exists with non-empty file.
2. Cascade sources, cheapest first: TDM API for known publisher → OA aggregator → browser. Each fallback is more expensive (rate, time, fragility).
3. Respect rate limits: defaults are conservative (--delay 2.0). For long runs use --long-pause-every and --long-pause-sec to avoid cumulative ban.
4. Don't trust HTTP 200: many publisher APIs return 200 with HTML "subscribe to read" page. Validate content (PDF magic bytes, XML body markers like <ce:para>).
5. Validate before declaring done: spot-check 5 random files manually before reporting success.

Common pitfalls

Pitfall	Symptom	Fix
Empty PDF/XML directories created on failure	"Downloaded N papers" but files are 0 bytes	Validate file size; remove empty dirs (this code does it via _cleanup_article_dir)
Cloudflare blocks headless Playwright	403 / "Just a moment..."	Use OpenClaw browser with profile="user", not headless
Rate-limited mid-batch	429s, then permanent block	Increase --delay, set --long-pause-every 200, respect Retry-After
Springer subscription returns HTML "subscribe"	Saved 0-byte or junk PDF	Code checks %PDF magic bytes — use the SpringerClient, don't bypass
DOI case sensitivity	Some publishers 404 on uppercase	Code normalizes; if writing your own, always .lower()
.abs suffix on Crossref DOIs	404 from Crossref	Strip .abs before query

When to ask the user

• Before running >1000 publisher API requests (institution may have weekly quota)
• Before browser scrape loop (will tie up their Chrome for ~5 sec/paper)
• When >30% of fetches fail unexpectedly (network / auth problem — investigate before continuing)
• When you detect a publisher with no API + no OA — confirm whether to skip or try browser

File layout

paper-fulltext-harvest/
├── SKILL.md                       (this file)
├── references/
│   ├── tdm-apis.md                Per-publisher TDM API details
│   └── browser-fallback.md        Browser scraping guide for paywalled non-TDM publishers (Route A)
└── scripts/
    ├── .env.example               Template for API keys
    ├── pyproject.toml             Dependencies (pip/uv installable)
    ├── redownload_elsevier.py     Resume-safe Elsevier bulk downloader
    └── auto_paper_download/       Main package
        ├── __init__.py
        ├── __main__.py            CLI entrypoint
        ├── publishers.py          25 DOI prefixes → publisher family + handler + support tier (shared with auto-paper-harvester)
        ├── clients.py             ElsevierClient, WileyClient, SpringerClient, CrossrefClient, UnpaywallClient, OpenAlexClient
        ├── downloader.py          Orchestration: parse savedrecs, route by publisher, batch download
        └── supplements.py         Supplementary file downloader