Changing configuration structure to enable multiple accounts.

This change enables using multiple wire plugins at the same time.
Also, we now distinguish between the wire plugin (i.e. EBICS or
taler_bank) and the wire method (i.e. SEPA or x-taler-bank) that
the wire plugin is implementing.  The "taler-bank" wire method
was renamed from "test" to "x-taler-bank".

This also changes the format of the /wire response of the exchange,
as we now need to return multiple accounts.  Note that wire fees
are specified per wire method, not per wire account.

taler-exchange-keyup now automatically signs all of the /wire
responses in the location specified by the configuration.

Account identification in wire plugins was changed to use
payto://-URLs instead of method-specific JSON fields.  Signing
and validation of /wire responses was moved from each wire
plugin to a generic validation method in libtalerutil (crypto)
or libtalerjson (for JSON-formatted inputs).
Convenience methods were added to generate JSON for wire accounts
(salting, signing).

Various section and option names were adjusted to streamline the
configuration and make it more consistent overall.  Documentation
was updated as well.

1 files changed, 87 insertions, 16 deletions

diff --git a/contrib/exchange-template/config/exchange-common.conf b/contrib/exchange-template/config/exchange-common.conf
index 47782651d..425bb92b2 100644
--- a/contrib/exchange-template/config/exchange-common.conf
+++ b/contrib/exchange-template/config/exchange-common.conf
@@ -17,27 +17,98 @@ TESTRUN = YES
 [exchangedb-postgres]
 DB_CONN_STR = "postgres:///talercheck"
 
+[auditordb-postgres]
+DB_CONN_STR = "postgres:///talercheck"
 
-[exchange-wire-sepa]
-# Change here to enable SEPA wire transfers.
-ENABLE = NO
 
-# Response for /wire
-SEPA_RESPONSE_FILE = "sepa.json"
+# Provide account information
+[account-1]
+# Accounts must have a payto:// URL
+URL = payto://METHOD/DETAILS
+
+# To be included in /wire, accounts must have a signed wire file
+# Must match URL.
+WIRE_RESPONSE = ${TALER_CONFIG_HOME}/account-1.json
+
+# For access to the account, we need to know the plugin.
+PLUGIN = "ebics"
 
-[exchange-wire-outgoing-sepa]
-# TBD
+# TBD: authentication data.
 
+# Accounts need to be enabled for the aggregator to debit them.
+ENABLE_DEBIT = NO
 
-[exchange-wire-test]
-# Change here to disable TEST wire transfers.
-ENABLE = YES
+# Accounts need to be enabled for the wirewatcher to look for credits into them.
+ENABLE_CREDIT = YES
+
+[account-2]
+URL = payto://x-taler-wire/bank/2
 
 # Response for /wire
-TEST_RESPONSE_FILE = "test.json"
+# Must match URL.
+WIRE_RESPONSE = ${TALER_CONFIG_HOME}/account-2.json
+
+PLUGIN = taler_bank
+
+# We also may need authentication data.
+TALER_BANK_AUTH_METHOD = "none" # or basic
+# TALER_BANK_USERNAME = user
+# TALER_BANK_PASSWORD = pass
+
+# Accounts need to be enabled for the aggregator to debit them.
+ENABLE_DEBIT = YES
+
+# Accounts need to be enabled for the wirewatcher to look for credits into them.
+ENABLE_CREDIT = YES
+
+
+# Wire fees are specified by wire method, NOT by wire plugin.
+[fees-x-taler-bank]
+# Fees for the forseeable future...
+# If you see this after 2018, update to match the next 10 years...
+WIRE-FEE-2018 = EUR:0.01
+WIRE-FEE-2019 = EUR:0.01
+WIRE-FEE-2020 = EUR:0.01
+WIRE-FEE-2021 = EUR:0.01
+WIRE-FEE-2022 = EUR:0.01
+WIRE-FEE-2023 = EUR:0.01
+WIRE-FEE-2024 = EUR:0.01
+WIRE-FEE-2025 = EUR:0.01
+WIRE-FEE-2026 = EUR:0.01
+WIRE-FEE-2027 = EUR:0.01
+
+CLOSING-FEE-2018 = EUR:0.01
+CLOSING-FEE-2019 = EUR:0.01
+CLOSING-FEE-2020 = EUR:0.01
+CLOSING-FEE-2021 = EUR:0.01
+CLOSING-FEE-2022 = EUR:0.01
+CLOSING-FEE-2023 = EUR:0.01
+CLOSING-FEE-2024 = EUR:0.01
+CLOSING-FEE-2025 = EUR:0.01
+CLOSING-FEE-2026 = EUR:0.01
+CLOSING-FEE-2027 = EUR:0.01
+
+[fees-sepa]
+# Fees for the forseeable future...
+# If you see this after 2018, update to match the next 10 years...
+WIRE-FEE-2018 = EUR:0.01
+WIRE-FEE-2019 = EUR:0.01
+WIRE-FEE-2020 = EUR:0.01
+WIRE-FEE-2021 = EUR:0.01
+WIRE-FEE-2022 = EUR:0.01
+WIRE-FEE-2023 = EUR:0.01
+WIRE-FEE-2024 = EUR:0.01
+WIRE-FEE-2025 = EUR:0.01
+WIRE-FEE-2026 = EUR:0.01
+WIRE-FEE-2027 = EUR:0.01
 
-# What is the main website of the bank?
-BANK_URL = "https://bank/"
-# Into which account at the 'bank' should incoming
-# wire transfers be made?
-BANK_ACCOUNT_NUMBER = 2
+CLOSING-FEE-2018 = EUR:0.01
+CLOSING-FEE-2019 = EUR:0.01
+CLOSING-FEE-2020 = EUR:0.01
+CLOSING-FEE-2021 = EUR:0.01
+CLOSING-FEE-2022 = EUR:0.01
+CLOSING-FEE-2023 = EUR:0.01
+CLOSING-FEE-2024 = EUR:0.01
+CLOSING-FEE-2025 = EUR:0.01
+CLOSING-FEE-2026 = EUR:0.01
+CLOSING-FEE-2027 = EUR:0.01