Creates list of attachments in arcgis repos

arcgis_attachments.py

# coding: utf-8
import requests
import sys

# Replace these values
instance='REPLACEME.arcgis.com/REPLACEME'
document='REPLACEME'
layer='REPLACEME' #usually 0

baseURL='https://'+instance+'/ArcGIS/rest/services/'+document+'/FeatureServer/'+layer
outputfn=document+'.csv'

# Fetch ObjectIDs
queryObjectsURL=baseURL+'/query?where=1%3D1&objectIds=&time=&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&resultType=none&distance=0.0&units=esriSRUnit_Meter&returnGeodetic=false&outFields=&returnGeometry=true&multipatchOption=xyFootprint&maxAllowableOffset=&geometryPrecision=&outSR=&datumTransformation=&returnIdsOnly=true&returnCountOnly=false&returnExtentOnly=false&returnDistinctValues=false&orderByFields=&groupByFieldsForStatistics=&outStatistics=&having=&resultOffset=&resultRecordCount=&returnZ=false&returnM=false&returnExceededLimitFeatures=true&quantizationParameters=&sqlFormat=none&f=pjson&token='
oi_json = requests.get(queryObjectsURL).json()
if 'objectIds' not in oi_json:
    print("Unable to retreieve objectIds")
    sys.exit(1)

all_ids = oi_json['objectIds']
print('Found ' + str(len(all_ids)) + ' objects\n')
print(all_ids)

# Fetch Attachments
output = open(outputfn, 'w')
output.write(baseURL+'\n')
output.write('Image URL\tImage Filename\n')
queryAttachmentURL=baseURL+'/queryAttachments?f=json&objectIds='
# Batches of 100
batchSize=100
while len(all_ids) > 0:
    # Prepares query for 100 Objects
    ids = []
    for x in range(0, batchSize):
        if (len(all_ids) > 0):
            ids.append(str(all_ids.pop()))
    ids = ','.join(ids)
    qAURL = queryAttachmentURL+ids
    print('Fetching attachments from ' + qAURL)
    # Creates attachment URLs according to JSON data
    at_json = requests.get(qAURL).json()
    if 'attachmentGroups' in at_json:
        print('Found ' + str(len(at_json['attachmentGroups'])) + ' attachment groups')
        for ag in at_json['attachmentGroups']:
            pID = str(ag['parentObjectId'])
            print('Attachment group: ' + pID + ' has ' + str(len(ag['attachmentInfos'])) + ' entries')
            for ai in ag['attachmentInfos']:
                aID = str(ai['id'])
                aName = str(ai['name'])
                aURL = baseURL+'/'+pID+'/attachments/'+aID
                output.write(aURL+'\t'+aName+'\n')
output.close()